10 Meter Quarter Wave Vertical






#3 -- Two-Meter Full-Dimension Bobtail Curtain A full-sized bobtail curtain is really easy at two meters. HF verticals are versatile, and can deliver both multiband and monoband performance. The quarter-wave plate is mounted in a rotation stage. 14 meters above ground. new at ac6v. It has a 4 MHz bandwidth with an SWR of less than 2 to 1. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. Today, I’m going to show you how you can easily build a homebrew 2 Meter ¼ Wave vertical antenna for under $10. 1 Ground System antenna is made one-quarter wavelength (h/ 4), the point Z will have an impedance of about 40 to 50 ohms. 8 feet 10 meters 8. Despite the fact that I used 75 Ohm low-loss satellite TV co-ax as the feeder, the SWR is 1. Which is 235. 38 meters, but I rounded off the length to 67 feet/20. The base of the antenna is about 3. Use either an electrician vinyl tape or a plastic tie, rather than a metal tie. The basics: Each "L" and each elevated radial are a quarter-wave. on more than a single band. For the receiving antennas an 8 MHz horizontal dipole and a quarter wave vertical dipole were used with a precision antennuator between the antenna and a GPR-90 receiver. An effective emergency antenna used by many amateur radio operators is fashioned by making a 1/2 wave antenna using coaxial cable. The product requires no radials, no tunings, or adjustments. sfi a & k index. The 10 meter trap acts as a loading coil on 12 meters, so we can’t use a full quarter wavelength or the radiator on that band either. nl wrote: >Hello Ken, > >I would not use the 5/8 wave antenna, unless you can make a dipole of >1. The two dipoles in each array are driven 90 degrees out-of-phase with each other to create a cardiod radiation pattern that has maximum gain. A slingshot, fishing line, and a sinker to launch the horizontal portion of the antenna into a tree notch approximately 30 feet/9. There are usually four radials, three being a minimum, but you could use up to six. The normal quarter wave ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. But to get an electrical quarter wave,. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. A quarter-wave choke of coax is grounded at the socket. The 5/8th wave is a great antenna misunderstanding example. Shop for 2 Meter Antennas here. designing linear loaded hatted vertical dipole. A bobtail curtain (a popular antenna for 40 meters) is a co-phased array of three quarter-wave vertical wire elements that are spaced about one-half wavelength apart. The feed impedance of a Delta Loop is around 100 ohms so you will have to use a quarter wave length of 75-ohm coax to feed this antenna which is user supplied. It has a 4 MHz bandwidth with an SWR of less than 2 to 1. MFJ1793 MFJ Vertical HF Antenna 20/40/80 mts. Remember that we need ELECTRICAL quarter waves rather than physical quarter waves Find a physical full wave from the formula L = 300 / F(MHz). Standing a tall 39 feet with full-size elements and rated at 5 kW, the AV-18JR Hygain HyTower-Jr is the world’s second best* performing vertical! Stub-decoupling is used to give full-size quarter wave radiators on 40, 20, 15, 10 Meters with super efficient cage loading on 80 Meters. Enter the desired frequency. Maybe one could get by with a quarter wave designed vertical, but I even doubt that would be effective. 3 inch long, stainless steel quarter wave omnidirectional whip antenna with chrome finish for operation in the 806-896 MHz frequency range, with NMO base. This calculator will help you to calculate the different wavelength of antennas based on the frequency. It is close enough to a 1/2 wave on 15 meters so it should load up pretty well there also. 6 MHz and less than 1. Standing a tall 39 feet with full-size elements and rated at 2 KW, the AV-18JR Hy-Gain HyTower-Jr. But to get an electrical quarter wave,. A quarter-wave ground-plane radiates very little "up" and "down" - so it's certainly not an isotropic radiator. The base of the antenna is about 3. 5Mhz to 50Mhz on non choke balun version). It is just broadly accepted, often without a moment's thought, that a 5/8th wave has 3 dB gain. 5:1 or less! Find DX Engineering 80 Meter Full Size Quarter Wave Vertical Antennas DXE-7580FS-VA-1 and get Free Standard Shipping on orders over $99 at DX Engineering!. I had no reason to make my vertical anything shorter than the full length of my 9 meter squid pole. My understanding is that when building or installing an antenna designed to operate over a ground plane (e. One can simply understand the function and directivity of an antenna by. Just to add a little to Jack Fraser’s good answer… In the case of radio waves - electromagnetic waves - you can calculate the free space wavelength of a given frequency as below:- c = f λ therefore λ = c / f where: c = speed of light in meters per. So, that leaves out bi-directional. The current magnitude and phase distribution is shown in green. Here are my hints and tips to help you get the most channels with your indoor antenna. There are no holes to dig and no concrete to buy and pour. And why not? No question is silly. morseaids programs: 20. I was shocked at the quarter-wave vertical per-formance. If you are an amateur radio enthusiast with. But to get an electrical quarter wave,. 200 MHz as my designated. The impedance of this dipole at 40 meters should be about 12 ohms. The 5/8 wave vertical only gives the published gain over a >large good conducting ground plane. In the summer of 2010, I decided to construct a 1/4 wave 80 meter vertical using 3" OD Aluminum Tubing. 3 feet 17 meters 13. eHam Forums > HomeBrew >. 58 twinlead Quarterwave in space is: 34. 3 coming out of the gates the first time it pretty good! Using a antenna analyzer to sweep the frequencies will show were the lowest SWR is allowing you to adjust the antennas lengths to were you want it to have the lowest SWR. Using the example above, you need a 14. It will be aimed toward Europe. There are presently 10 antennas on it and all the feeds and control lines come off at ground level and go underground to the house. 8 feet 10 meters 8. antennas that are tunable to operate over segments of the entire 75/80 meter band with an SWR of 1. This articles presents techniques of feeding dipoles. Put the 24 in. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. In the case of the Hamstick mobile whip, I have subtracted the loss resistance due. A high performance of 80/40 vertical meters. During what turned out to be an extended tower-raising project (Going from 55 feet to 90 feet), I had my beam down and I needed an antenna that could provide the necessary gain and angle of radiation to talk to my friend Skip down at the South Pole. That is, each quarter (in time) of the wave is identical to any other if you simply flip it around the horizontal axis and/or rotate it upright about its peak. 5:1 • No Tuner needed • Bandwidth: Over 750 kHz. 160 meters 123 - 136 feet 80 meters 65 - 70 feet 40 meters 34. MFJ1793 MFJ Vertical HF Antenna 20/40/80 mts. I built the stand from old redwood that I got from taking apart an old deck I built many years ago. This antenna is similar in construction to the 2-meter OFC sleeve dipole I built over 8 years ago, but it is a simple center-fed dipole. 4 As described in the journal articles, the original TASH antenna consisted of a right triangle of conductive material rolled to form the. The fish aren’t biting, and in her boredom the lady notices that the vertical distance between a crest and a trough of a water wave passing the boat is one-quarter the height of the boat. The antenna design can work with any band, provided that a support of sufficient height is available. 1 MHz) 65 ft 11 in 30 46 ft 3 in 20 33 ft 0 in 17 25 ft 10 in 15 22 ft 1 in 12 18 ft 9 in 10 (28. antennas that are tunable to operate over segments of the entire 75/80 meter band with an SWR of 1. -It includes suction cups for attaching to a wall. #3 -- Two-Meter Full-Dimension Bobtail Curtain A full-sized bobtail curtain is really easy at two meters. The usual way to eliminate the requirement for a complicated and space consuming ground system is to center feed a 1/2 wave (in this example a 66' tall) antenna. The real practical advantage of the small loop compared to a short vertical whip say tuned against earth or a full quarter-wave vertical antenna is the loop’s relative freedom from dependence on a ground plane and earth achieving efficient operationfor ; this unique. To use the calculator, enter the desired operating frequency in megahertz to get a starting length in both feet and meters for building a quarter-wave vertical antenna. HF Vertical Antennas and Packages. It comprises a half wave vertical element over a quarter wave element, with a shorter stub and single turn loop concentric with the vertical elements to complete the phasing device. A single or multiband quarter wave resonator 54 for a wireless communications band or bands may be utilized on dielectric substrate 56. We used 80 and 40 meters since those are the most difficult bands for the average ham with a modest station to work DX. I have looked on a few sites that show others using a 1:1 air coil balun on their antennas. After looking at my 80/40 meter vertical I thought, "Hey, I like to operate on 20 also. 8 MHz) 123 ft 2 in 40 (7. 82 foot ground radials Five eights wave Vertical is: 21. This antenna is no quarter wave vertical with 120 full-length radials, or even a half wave dipole a half wave high, but it seems to be working for me so far. san diego emergency pages. AEcreative 10-160 Meter Amateur ham HF Band Radio Wire Loop Antenna Balun Unun DIY kit T200-2 Type 2 Iron Powder ferrite toroid core 16AWG Enameled Magnet Winding Wire 3. Such antennas must work against a good ground or counterpoise sys- tem to furnish the other quarter-wave to Complete the dipole antenna. This article describes three methods to add 60 meters to your Butternut vertical without losing any other bands. 40 meter band: On 40 meters the MFJ-1778 (G5RV) functions as "two half-waves in-phase" fed with a quarter-wave impedance matching transformer. i used to have 2 3 element beams for 10 meters , one up at 55ft. If are stations trying to call in. A single or multiband quarter wave resonator 54 for a wireless communications band or bands may be utilized on dielectric substrate 56. Here is a handy chart for determing 1/4 wave verticals, 1/2 wave dipoles, and full wave loop lengths. Glasgow appears to have based the current and voltage distribution of an antenna on the observed behaviour of transmission lines, much the same as other respected authors have done. The DX Engineering 68 foot vertical antenna supplies the highest possible performance to achieve the strongest possible presence at your power level and be competitive. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. 40 meter quarter wave vertical with loading coil This afternoon, I’ve been playing with an 8 meter fishing pole in the garden, clamped to a 3 meter aluminium pole with 2 x 10 meter elevated radials sloping from the feedpoint at 3 meters to fence height. This has 4 x sloping radials at 45 degrees with a feedpojnt up at about 7 meters in the air. the earth, possibly coupled using additional radial wires, or a car roof of unspecified size), provided that it is sufficiently large compared to the wavelength. Center Frequency: 28. Here are my hints and tips to help you get the most channels with your indoor antenna. Thus far, this design outperforms all others I’ve tried by a considerable margin. This is 1005 divided by whatever frequency you are going to talk on. Note the lengths for the new 60 meter band frequency to be effective March 5, 2012. Six Meter Rigid Dipole; VHF Airband 1/4 Wave Ground Plane Base Antenna; FM BAND Antennas. MFJ1793 MFJ Vertical HF Antenna 20/40/80 mts. The two dipoles in each array are driven 90 degrees out-of-phase with each other to create a cardiod radiation pattern that has maximum gain. 22 one side. Dipole Antenna Calculator. instead of 75 Ohm for the quarter wave lines. center frequency +/- 10 %). I currently have a 40 meter quarter wave vertical antenna with 10 quarter wave ground radials. Quater-wavelength in meters: 71. 1/2 Wave Vertical. new at ac6v. We can distinguish three field regions where the electromagnetic wave develops: reactive near. 5 / frequency in MHz. I used the formula Length of Dipole (feet) = 468 / Frequency (MHz). There are no holes to dig and no concrete to buy and pour. Quarter wavelength at 145. The fish aren’t biting, and in her boredom the lady notices that the vertical distance between a crest and a trough of a water wave passing the boat is one-quarter the height of the boat. The half-wave dipole is very simple to construct. WORKMAN 104 VHF/UHF SWR Meter; Antenna Parts; Ground Plane Kits; Instructions. There is no collinear mobile design for HF frequencies due to the extremely large components necessarily that make a mobile design impractical. 5 MHz, Length 10 meters. Here are my hints and tips to help you get the most channels with your indoor antenna. Amateur Antennas : The Solarcon A99 is a half wave over a quarter wave variable mutual inductance antenna for 10 to 17 meters. com in 2 categories. I built this highly modified 5/8 wavelength vertical antenna on Sunday, 26 August 2013, and was pleasantly surprised by its performance, considering the generally poor. #6 Marconi , Dec 26, 2008. The frequency is tuned to GPS range, 1. A slingshot, fishing line, and a sinker to launch the horizontal portion of the antenna into a tree notch approximately 30 feet/9. The second reason you may want to use the 5/8 wave vertical is to obtain a lower angle of radiation. However, as I am always keen to work any DX and having experienced a single quarter wave vertical on 80m and the advantages of a phased array I decided that I could put up another vertical for 40m on the site of my original 80m vertical as the mounting bracket was still there and. 34 foot ground plane Three Quarter wave Vertical: 25. The stand is plenty stout to handle the 23. Otherwise, you will have to cut the lines 3/4 lambda long. NEW!! Optional spring for the CA-2x4SR and CA-2x4SRNMO. You may have noticed a pattern developing here. homemade folded dipole. The N6LF vertical H antenna is an off center fed, capacitively loaded, vertical short dipole. The distance between one point to another adjacent point in a wave is known as the wavelength. Good Vertical Antennas • A straight quarter-wave (Best) –λ/4 ~ 125 ft at 1830 kHz with THHN • Inverted L (Good) –Go straight up as high as you can with a wire, then bend the remaining wire to run horizontal to resonate it • Tee vertical (A bit better than L) –Like an inverted L, but the top is extended in opposite directions. Without Radials. Centerfire Antenna, LLC PO BOX 8305 South Bend,IN 46660. Vertical antennas are radiate in all directions around the antenna, unlike dipoles which are a bit directional. In the summer of 2010, I decided to construct a 1/4 wave 80 meter vertical using 3" OD Aluminum Tubing. For the 10 meter band only, and you need to shorten it. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. A slingshot, fishing line, and a sinker to launch the horizontal portion of the antenna into a tree notch approximately 30 feet/9. Here's my homebrew 30 meter full quarter wave vertical. The SWR meter has to fall on a 1/2-wave point on the coax run. and one at 15 , i used the low one for "in the country" yackin and. Sine waves exhibit quarter wave symmetry. san diego tourism sd wx. Horizontal polarization is rarely effective on 160 meters If possible, use a full size quarter wave vertical install at least 120 feet from all tall towers (over 80 feet tall) use much more than 120 feet of spacing for best performance An Inverted-L vertical can also be very effective. By Mike Higgins, K6AER. 1 Ground System antenna is made one-quarter wavelength (h/ 4), the point Z will have an impedance of about 40 to 50 ohms. This antenna may be built as a 20 meter, 17 meter, 15 meter, 12 meter or 10 meter monoband vertical antenna. The usual way to eliminate the requirement for a complicated and space consuming ground system is to center feed a 1/2 wave (in this example a 66' tall) antenna. It's not quite like a ground plane (about 35 ohms, but higher if you droop the radials) or a half wave dipole (about 70 ohms, but lower if you make it an inverted-vee). The base of the antenna is about 3. Consider two things: 1) According to the ARRL Antenna Book, a quarter wave vertical antenna with fifteen 1/4 wave ground radials may have an efficiency of only 50%; with fewer radials the efficiency suffers even more. The 5/8th wave is a great antenna misunderstanding example. The large diameter yields broadbanded coverage of the 80 Meter Band. The product requires no radials, no tunings, or adjustments. All you need is one beverage bottle. 5:1 • No Tuner needed • Bandwidth: Over 750 kHz. Just to add a little to Jack Fraser’s good answer… In the case of radio waves - electromagnetic waves - you can calculate the free space wavelength of a given frequency as below:- c = f λ therefore λ = c / f where: c = speed of light in meters per. That said, EFHWs are nowhere as good as a quarter wave vertical for DX purposes, even when erected vertically. The fish aren’t biting, and in her boredom the lady notices that the vertical distance between a crest and a trough of a water wave passing the boat is one-quarter the height of the boat. The first system had 4 radials, also quarter-wave, attached to the base of the antenna, while the second system used 30 radials. For half a dozen reasons, antenna designers start off with a 90% quarter wave when using thin (#10 or smaller) wire. Each wire in the vertical is λ/4 long, adjusted for insulation, if appropriate. is about 2. It’s also a great antenna for emergency communication and can be fabricated and launched in a matter of minutes. 40m - another full wave wire loop between two trees, the top about 15m high. Enter the desired frequency. Primarily designed for use on the Amateur Radio bands…. Probably the best know antenna on our 11 meter band ! Everyone has used this type in the past or will use it somewhere! Although the half wave vertical comes along with various names the PRINCIPLE is all the same. There are no holes to dig and no concrete to buy and pour. Loaded Quarter Wave Antenna Inductance Calculator Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. It outperforms a regular quarter wave vertical with radials laying on the ground by a couple of S points and is a lot easier to put up. The 40 meter ZR verticals (by Force 12) are actually vertical dipoles, so they have no radials and were simply set to the right frequency. By using top quality materials, proven antenna knowledge and their patented tunable tip design, they built a pair of dependable antennas you can count on for your day to day communications. This is why a lot of the 50,000 watt clear channel radio stations use 1/2 wave and even 5/8 wave antennas. With a value of 0. Include your state for easier searchability. To tune an antenna, use an SWR meter attached between the transmitter and antenna feed-line. It outperforms a regular quarter wave vertical with radials laying on the ground by a couple of S points and is a lot easier to put up. Note the lengths for the new 60 meter band frequency to be effective March 5, 2012. The bottom section is a twenty-foot, two inch diameter aluminium tube. In the summer of 2010, I decided to construct a 1/4 wave 80 meter vertical using 3" OD Aluminum Tubing. RETURN TO HOME PAGE. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. Quarter-wavelength in feet: 234 / frequency in MHz. MFJ-1796 Vertical Antenna INTRODUCTION The basic 40 meter quarter wave vertical antenna is 33' tall and requires a reasonably good ground or counterpoise system to function properly. High Performance 40 Meters Vertical. The normal quarter wave ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. The instantaneous value of a sine wave one quarter of the way through the cycle will be equal to the peak value. On 10 meters, it actually loses gain. Have you thought about creating a q/wave wire vertical, using perhaps a tree or. The standard quarter-wave radiator loads up against a ground plan with a typical impedance of 36Ω which will match the standard 50Ω coax feed line with a SWR (standing wave ration) of about 1. of Cleveland, Ohio, offering quarter-wave antenna performance for 40, 20 15 and 10 meters , but requiring no band switching! Later, the Hustler Four Band Trap Vertical, known around the world as the 4-BTV, was made available with an 80 meter resonator, and the 5-BTV was born. An unloaded quarter-wave vertical antenna has a radiation resistance of about 35 ohms with negligible ohmic or conductor loss, but ground 15 and 10 meters. linear polarizer (LPNIR-100), quarter-wave plate (WPQ05M-1310), and power sensor (S132C) (wave plate only used for circular polarization), or incident upon a polarimeter (PAX5710IR2-T). 5 : 1 from 28. As the name suggests, the length of the antenna is about half of the wavelength of the frequency the antenna is cut for. The performance was excellent with. The larger the wire, the wider the bandwidth. Have you thought about creating a q/wave wire vertical, using perhaps a tree or. Build a 1/4 Wave HF Multiband Vertical for 40 - 10 Meters If you don't want to "fool" with adjusting each individual 1/4 wave vertical, then the use of a good antenna tuner in the shack should peak and tweak each band as long as the lengths of the vertical elements are close to 1/4 wave length or a bit longer. See details in the enclosed documents or on our website. Made out of aluminum tubing Uses PVC as an insulator Is 32 feet high. If you just connect it to your coax or rig you will be disappointed. We now have a quarter-wave folded dipole at 40 meters, the vertical analogue of which we have already discussed. I built the stand from old redwood that I got from taking apart an old deck I built many years ago. antenna specifically for the 75/80 meter bands. Both antennas have better DX potential than a quarterwave vertical. Are you looking for a fun and easy antenna project? The 1/4 ground plane might be just the ticket. X 30A Vertical 2m/70cm: X 50A Vertical 2m/70cm: X 200A Vertical 2m/70cm: X 300A Vertical 2m/70cm: X 510HDM Vertical 2m/70cm: Gap: Eagle DX HF Vertical 40/20/17/15/12/10 Meters : Mounts Tilt Ladder Mount: Hustler: 4BTV/5BTV HF Verticals: G3-144 Vertical 2 Meter : MFJ: MFJ-1625 Window/Balcony Antenna 80-6 Meters: MP. ac6v humor. We now have a quarter-wave folded dipole at 40 meters, the vertical analogue of which we have already discussed. As usual, Figure 2 —Gain of a quarter-wave 80 meter vertical antenna over average soil, as the number of buried radials is varied, for seven different total. A high performance of 80/40 vertical meters. The 10 meter trap acts as a loading coil on 12 meters, so we can’t use a full quarter wavelength or the radiator on that band either. The usual way to eliminate the requirement for a complicated and space consuming ground system is to center feed a 1/2 wave (in this example a 66' tall) antenna. the quarter-wave vertical element. Primarily designed for use on the Amateur Radio bands…. The fish aren’t biting, and in her boredom the lady notices that the vertical distance between a crest and a trough of a water wave passing the boat is one-quarter the height of the boat. The shortest antenna that has a chance of tuning all bands has an electrical length of 143 feet and should be trimmed to give a quarter wave resonance at 1. The entire radiator length of the vertical antenna is active on all frequencies except for fifteen meters where the upper portion of the antenna is decoupled above an end of a fifteen-meter quarter-wave decoupling stub in a first embodiment. 5 ft off the ground and the radials slope down from there to about a foot off of the ground. 8 MHz, so it will be 97. Against a delta loop for 20m, for example, I found an EFHW will be a good 3dB down. The monopole radiator was made to be significantly thicker than the radials. In the example below, the period is 10. 7 dBi gain and 18° Vertical Beamwidth. All quarter wave vertical antennas need an earth system to work against. 40/20 Meter Half-Wave. 6 feet 12 meters 9. Two 75-meter whips were almost three S-units (about 18 dB) below a half-wave 75-meter dipole (no wonder, since a 75-meter half wave dipole is 130 feet compared to the 16 feet of the two whips). This antenna is 58 ft tall and is mounted on a hinged base. 5:1 • No Tuner needed • Bandwidth: Over 750 kHz. Quarter-wavelength in feet: 234 / frequency in MHz. ost commercial 2-meter repeater antennas with gain fall into two categories: collinear arrays and stacked element arrays, with gains ranging from 3 to 9 dB1. In practice it's best to make the antenna a little longer than the calculated value and then trim it to get the best SWR value. Inside the box is a 50 ohm 1:1 Balun. The element is a current-fed quarter wave on 40 meters. DX Engineering 80 Meter Full Size Quarter Wave Vertical Antennas, model DXE-7580FS-VA-1, are high performance 68 ft. 40/20 Meter Half-Wave. A quarter-wave ground plane is sort of like a vertical dipole, it radiates horizontally in all directions. 58 twinlead Quarterwave in space is: 34. This has 4 x sloping radials at 45 degrees with a feedpojnt up at about 7 meters in the air. You are now the proud owner of a Comtek 20 Meter Vertical Antenna. ac6v humor. My 40 meter vertical cost me $13. It worked well. As a result the five eighths wavelength vertical is used in many instances. This antenna is 58 ft tall and is mounted on a hinged base. See full list on n1fd. FM Band Outdoor Dipole Antenna; Tunable 87-108 MHz FM Band Broadcast Antenna; 87-108 MHz FM Band Quarter-Wave Base Antenna; Adapters; Coax Cable; Meters, Parts, Kits. is the world's second best performing vertical! Stub-decoupling is used to give full-size quarter wave radiators on 40, 20, 15, 10 Meters with super efficient cage loading on 80 Meters. The DX Engineering 68 foot vertical antenna supplies the highest possible performance to achieve the strongest possible presence at your power level and be competitive. homemade folded dipole. Just to add a little to Jack Fraser’s good answer… In the case of radio waves - electromagnetic waves - you can calculate the free space wavelength of a given frequency as below:- c = f λ therefore λ = c / f where: c = speed of light in meters per. 40m - another full wave wire loop between two trees, the top about 15m high. Ideas (cheap) for Vertical Antenna Insulators. The frequency is tuned to GPS range, 1. This is why a lot of the 50,000 watt clear channel radio stations use 1/2 wave and even 5/8 wave antennas. The Arrow GP52 is a quarter wave, 6 meter vertical antenna covering 50 to 54 MHz. The bandwidth of a quarter-wave notch filter is about 20 % (i. This articles presents techniques of feeding dipoles. You may have noticed a pattern developing here. Within 1dB of full-size quarter-wave vertical antennas can cover up to 20 meters. The time it takes to complete one cycle is called the period and is denoted with the symbol T (for Time). sfi a & k index. You can drag the antenna anywhere. For medium-wave (AM) broadcasting, quarter-wave masts are between 153 feet (47 m) and 463 feet (141 m) high, depending on the frequency. Full size quarter wave radiator for 40 Meters --that’s 33 feet of radiating power. channels for export, commercial and 10 meter ham band use, input 2000 watts P. RETURN TO HOME PAGE. Sticking out of the top of the tube is a seven foot length of one and a half inch diameter tube. 33 ft fiberglass 1. Many thanks!. Set dimension “D” (figures 5 and 6). The second reason you may want to use the 5/8 wave vertical is to obtain a lower angle of radiation. A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9. Because these antennas are used by Search and Rescue teams off-highway as much as they are for traditional on-highway use, customers have often asked if. Material: pvc, coaxial line. Dipole Antenna Calculator. It gave the impression it was a mediocre antenna. The current magnitude and phase distribution is shown in green. Given that a quarter wavelength on 7100 kHz is just a smidgen over 10 meters, it seemed that not much loading would be necessary to make a 8 to 9 meter conductor look like a 10 meter one to radio frequencies. It is "unbalanced" having one connection to the vertical element and uses an earth connection or simulated earth connection to provide an image for the other connection. KY - White Leghorn Pullets). 00! Wow! These guys are making some good markup! Features of the K0WA 40 meter verticle. 5 foot boom). It is close enough to a 1/2 wave on 15 meters so it should load up pretty well there also. The second reason you may want to use the 5/8 wave vertical is to obtain a lower angle of radiation. Both the 80/40 meter wire and the 20 meter wire are connected in parallel at the bottom of the vertical. 29 twinlead Quarterwave Vertical is: 32. 1/2 Wave Vertical. On 10 meters, it actually loses gain. That is a standing wave of water. Enter the desired frequency. Once the SWR is good for the 40 meter band, you can test 20, 15, 10 and 6 Meters. Stainless Terminated Folded Dipole T2FD 10M~40M 33' 20, 15 and 10 meter bands. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. 5/8th Wave Antenna Gain. The length of a quarter-wave vertical is: λ/4 = 246 K/f MHz. As a bonus it tunes up very nicely on the 12 and 6 meter bands. The performance varies from band to band when compared to a single band quarter wave vertical for each band it covers, it provides useable transmit coverage from 10 to 40 meters for most types of ham radio use. The 5/8 wave vertical only gives the published gain over a >large good conducting ground plane. The new Penetrator 500 is not a very efficient design. Amateur Antennas : The Solarcon A99 is a half wave over a quarter wave variable mutual inductance antenna for 10 to 17 meters. The total length of a dipole antenna for 10 MHz would then be 142. A bobtail curtain (a popular antenna for 40 meters) is a co-phased array of three quarter-wave vertical wire elements that are spaced about one-half wavelength apart. This is the antenna I have constructed : 10M Vertical Antenna by dxzone. Let's add a 20 meter quarter wave wire"; good on paper but bad idea. A half wave antenna's radiation peak angle is 20 degrees. The instantaneous value of a sine wave one quarter of the way through the cycle will be equal to the peak value. san diego tourism sd wx. The feed impedance of a Delta Loop is around 100 ohms so you will have to use a quarter wave length of 75-ohm coax to feed this antenna which is user supplied. However, as I am always keen to work any DX and having experienced a single quarter wave vertical on 80m and the advantages of a phased array I decided that I could put up another vertical for 40m on the site of my original 80m vertical as the mounting bracket was still there and. This antenna is similar in construction to the 2-meter OFC sleeve dipole I built over 8 years ago, but it is a simple center-fed dipole. Years ago when chasing 5BDXCC I was also able to relatively easily work and confirm over 100 countries on 80 meters both SSB and CW from California by using a pair of elevated Butternut HF-2V verticals spaced a quarter wavelength apart and having 3/4 wavelength sections of RG-8 connecting them. It is just broadly accepted, often without a moment's thought, that a 5/8th wave has 3 dB gain. The basic formula for determining the length of a center fed, half-wave wire Dipole or Inverted Vee antenna is:. 30 Meter (10. The Half-Wave Coaxial Antenna. Conventional solutions to this problem involve the use of radials. It was a CB vertical that I picked up from Radio Shack on sale because it was discontinued. World’s Second Best Vertical Antenna. morseaids programs: 20. Without Radials. Full size quarter wave radiator for 40 Meters --that’s 33 feet of radiating power. The current magnitude and phase distribution is shown in green. It is “unbalanced” having one connection to the vertical element and uses an earth connection or simulated earth connection to provide an image for the other connection. Frequency in MHz: Length of the vertical element:--. of Cleveland, Ohio, offering quarter-wave antenna performance for 40, 20 15 and 10 meters , but requiring no band switching! Later, the Hustler Four Band Trap Vertical, known around the world as the 4-BTV, was made available with an 80 meter resonator, and the 5-BTV was born. Bodenseesender Rohrdorf 150 guyed mast of lattice steel, height 240 metres, insulated against ground for daytime transmission; three guyed masts of lattice steel, height 137 metres, insulated against ground for nighttime transmission and as backup antenna. Keep it away from any large metal surface closer than about 1 wavelength. 2 W for an antenna cut for the 80-meter band, the radiation resistance can reach 36 W on the 10-meter band. That is a standing wave of water. UPS Ground shipping is 2-5 days, so you can expect your antenna in about 6-9 business days, depending on your location. What we need is a effective compromise antenna. An efficient quarter wave vertical will have an optimal SWR around 1. The 10 meter trap acts as a loading coil on 12 meters, so we can’t use a full quarter wavelength or the radiator on that band either. If the wave travels in a dielectric medium, for instance in the PCB material, the wavelength has to be divided by the square root of εr. 68 foot ground radials Five eights wave Vertical is: 21. Use our simple calculator to determine approximate dimensions of materials needed to build a vertical antenna. The most common is the quarter wave Inverted-L. Thus far, this design outperforms all others I’ve tried by a considerable margin. I am planning to add quite a few more radials and I have a question as to how long to make them. antenna specifically for the 75/80 meter bands. the quarter-wave vertical element. 58 X 3) : and I check if X=0 on this frequency, re-adjust if necessary. A quarter wave antenna with drooping quarter wave radials exhibits a nominal 50 ohms impedance, one reason for the existence of 50 ohm coaxial cable. I built this highly modified 5/8 wavelength vertical antenna on Sunday, 26 August 2013, and was pleasantly surprised by its performance, considering the generally poor. Also, an effective ¼ wave vertical needs a lot of ra-dials to make it efficient. antennas that are tunable to operate over segments of the entire 75/80 meter band with an SWR of 1. 1 Ground System antenna is made one-quarter wavelength (h/ 4), the point Z will have an impedance of about 40 to 50 ohms. Install the 40-meter tube on the top of the 30-meter trap. designing linear loaded hatted vertical dipole. 150 Mhz ) amateur radio band. — Single vertical antenna element, typically a quarter or more wavelengths long. This shortened easy-to-build vertical, with no-radials, is made from surplus military camouflage poles. 10 Meter Wire Antenna Sizes. The shortest antenna that has a chance of tuning all bands has an electrical length of 143 feet and should be trimmed to give a quarter wave resonance at 1. 10 Meter SSB. This antenna is very effective for DX operation, and feedline matching does not appear to be a problem, A simple tuning network may be used if desired. Antenna theory and antenna terminology can seem complicated to the uninitiated. The CA-2x4SR and CA-2x4SRNMO antennas are relatively stiff due to the phasing sections Comet uses in the radiating element in order to make the antenna both broadband and high gain. of Cleveland, Ohio, offering quarter-wave antenna performance for 40, 20 15 and 10 meters , but requiring no band switching! Later, the Hustler Four Band Trap Vertical, known around the world as the 4-BTV, was made available with an 80 meter resonator, and the 5-BTV was born. This could be 50 ohm types such as RG58, RG8X, RG8, RG213, or 75 ohm type such as RG11, RG59, RG6 or even 75 ohm twin lead. Most hams, including Ole Joe, will attest that the vertically polarized two meter J-Pole an-. 5″ tall with 4 97. These can also be used to seek information. Full size quarter wave radiator for 40 Meters --that’s 33 feet of radiating power. With that said, go look up the cost of one that is being sold in the magazines and on the web. frequencies. Everywhere we look, everything tells us the 5/8th wave has 3dB gain. As for working short skip , a 1/4 wave will work good , but a 5/8 or. And why not? No question is silly. Radiation resistance — Portion of antennas’ input impedance that results in transfer of electrical signal into a radiated electromagnetic wave. Are you looking for a fun and easy antenna project? The 1/4 ground plane might be just the ticket. antennas that are tunable to operate over segments of the entire 75/80 meter band with an SWR of 1. Homebrew multiband hf vertical antenna. After looking at my 80/40 meter vertical I thought, "Hey, I like to operate on 20 also. Quater-wavelength in meters: 71. Without Radials. The 10 meter trap acts as a loading coil on 12 meters, so we can’t use a full quarter wavelength or the radiator on that band either. I have looked on a few sites that show others using a 1:1 air coil balun on their antennas. This antenna requires a metal ground plane, is omnidirectional, offers Unity/2. The second reason you may want to use the 5/8 wave vertical is to obtain a lower angle of radiation. We can distinguish three field regions where the electromagnetic wave develops: reactive near. As shown in Fig t 1, when the Fig. The performance varies from band to band when compared to a single band quarter wave vertical for each band it covers, it provides useable transmit coverage from 10 to 40 meters for most types of ham radio use. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials. N5VEG 5 band vertical. Design Table: Half Wave Dipole BAND LENGTH (# 14 copper wire) 160 (1. I cut it to the proper length and fastened it to the eve of my house. The time it takes to complete one cycle is called the period and is denoted with the symbol T (for Time). This antenna may be built as a 20 meter, 17 meter, 15 meter, 12 meter or 10 meter monoband vertical antenna. Great deals on 10 Meter Antenna. 10 Meter CW Center Frequency: 28. Multi-band vertical antenna 160 through 10 meters (32. Also a full-size quarter-wave. Place the 30-meter trap on it, using clamp assemblies. Primarily designed for use on the Amateur Radio bands…. The single vertical, raised three metres performed very well and I started to have a lot of fun working DX on 40m. In the case of the Hamstick mobile whip, I have subtracted the loss resistance due. As a bonus it tunes up very nicely on the 12 and 6 meter bands. 1 Ground System antenna is made one-quarter wavelength (h/ 4), the point Z will have an impedance of about 40 to 50 ohms. Frequency 17 /7/3. of Cleveland, Ohio, offering quarter-wave antenna performance for 40, 20 15 and 10 meters , but requiring no band switching! Later, the Hustler Four Band Trap Vertical, known around the world as the 4-BTV, was made available with an 80 meter resonator, and the 5-BTV was born. There are no holes to dig and no concrete to buy and pour. A slingshot, fishing line, and a sinker to launch the horizontal portion of the antenna into a tree notch approximately 30 feet/9. Final charge, low loss fiberglass shape, high strength 6061 - T6 Aluminum tube, maximum power PEP of 1500 watts, requires grounding. Here is a handy chart for determing 1/4 wave verticals, 1/2 wave dipoles, and full wave loop lengths. 66 factor the lines will be too short to run to the center of the square (where the phasing box should be) with a quarter wave. 14 meters above ground. There is no trap for 40 meters. on more than a single band. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. With horizontal polarization at heights below 100 feet the antenna is practically omni-directional and has a high takeoff angle. All antenna lengths in the information below are in feet and are the results based on the standard formula of 468 / FMhz = total length in feet. The 2 meter full wave loop is so light, it can even be attached to most any non-conductive support with good tape. · The A99 is a half wave over a quarter wave variable mutual transductance tuned antenna. Dipole length in meters: 143 / frequency in MHz These are only approximate values. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. The easiest approach (and probably most light weight) would be the Marconi style vertical – a single quarter wave vertical radiating element and radials laid on the ground. Enter the desired frequency. 73, Bill… W5RWF. Probably the best know antenna on our 11 meter band ! Everyone has used this type in the past or will use it somewhere! Although the half wave vertical comes along with various names the PRINCIPLE is all the same. Because these antennas are used by Search and Rescue teams off-highway as much as they are for traditional on-highway use, customers have often asked if. This also helps on 10 meters, because there are also alot of guys with wire antennas, which for the most part are horizontal. See details in the enclosed documents or on our website. Build a 1/4 Wave HF Multiband Vertical for 40 - 10 Meters If you don't want to "fool" with adjusting each individual 1/4 wave vertical, then the use of a good antenna tuner in the shack should peak and tweak each band as long as the lengths of the vertical elements are close to 1/4 wave length or a bit longer. The 40 meter ZR verticals (by Force 12) are actually vertical dipoles, so they have no radials and were simply set to the right frequency. This antenna is similar in construction to the 2-meter OFC sleeve dipole I built over 8 years ago, but it is a simple center-fed dipole. Use the remaining length for the horizontal portion. At the top of the quarter wave transformer, where the half wave wire is connected to the co-ax, I put some PVC tubing over the end of the co-ax, the PVC tubing was filled with Silicon grease. Among the simplest of mobile antennas for VHF is the quarter wave vertical whip (often called a “stinger”). Be aware of the fact that the Quarter-wave notch filter will not only attenuate the design frequency and the frequency band around the design frequency, but it will also attenuate the frequency band around the odd harmonics of the design frequency. I built the stand from old redwood that I got from taking apart an old deck I built many years ago. Each wire in the vertical is λ/4 long, adjusted for insulation, if appropriate. 5 / 10 = 14. DX Engineering 80 Meter Full Size Quarter Wave Vertical Antennas, model DXE-7580FS-VA-1, are high performance 68 ft. As shown in Fig t 1, when the Fig. VK2PRC Quarter wave vertical, stationary mobile antenna for 20M Band Build this simple 1/4 vertices for 20 meters in a few minutes. Most stations on FM use simple vertical aerials, either a quarter-wave or half-wave. Resonance is achieved by either extending or retracting the antenna wires via a reel and pulley system. In both the left- and right-hand cases, a linear state is incident upon a quarter-wave retarder with the fast axis oriented at +45°, however the orientation of the input linear state is changed from Vertical to Horizontal. Copyright © 2009 Maple Leaf Communications P. In the perfectly matched system, the SWR is 1:1. The real practical advantage of the small loop compared to a short vertical whip say tuned against earth or a full quarter-wave vertical antenna is the loop’s relative freedom from dependence on a ground plane and earth achieving efficient operationfor ; this unique. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. You might also eliminate the 15 meter vertical section and use the 40 meter section as a third multiple on 15 meters. 5 / 10 = 14. 5 ft off the ground and the radials slope down from there to about a foot off of the ground. The smallest CB base station antenna would be a quarter-wave vertical, with quarter-wave radials at the bottom. 20-Meter “J” Pole Vertical. • Quarter wave vertical for 80 meters with elevated radials • Steppir DB42 antenna three elements on 30/40 meters, five elements on 20/17/15/12/10 meters, and eight elements on 6 meters, integrated SDA100 controller. The half-wave dipole is very simple to construct. 06 meters telescoping fiberglass mast (MFJ brand). • Remember, without the choke, the measured VSWR will be greater than 1:1 due to the unwanted radiation from the coax!. 17 inches divided by 4, or 24. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. In practice it's best to make the antenna a little longer than the calculated value and then trim it to get the best SWR value. This antenna is no quarter wave vertical with 120 full-length radials, or even a half wave dipole a half wave high, but it seems to be working for me so far. callbooks & qsl routes, advice: 30. 64 foot ground radials Five Eights wave Vertical is: 84. The time it takes to complete one cycle is called the period and is denoted with the symbol T (for Time). One of the easiest antennas to build is a traditional half-wave dipole. Probably the best know antenna on our 11 meter band ! Everyone has used this type in the past or will use it somewhere! Although the half wave vertical comes along with various names the PRINCIPLE is all the same. 5 feet 30 meters 24. HF Vertical Antennas and Packages. instead of 75 Ohm for the quarter wave lines. Use either an electrician vinyl tape or a plastic tie, rather than a metal tie. 5 / frequency in MHz. NOTE: HEX type beams, mini-beams, 10 meter beams do not provide an adequate "capacity hat". The phasing lines are quarter wave of 75 Ohm coaxial cable. Obviously, it is designed to give gain over the regular HT rubber duck. Probably the best know antenna on our 11 meter band ! Everyone has used this type in the past or will use it somewhere! Although the half wave vertical comes along with various names the PRINCIPLE is all the same. 1 Ground System antenna is made one-quarter wavelength (h/ 4), the point Z will have an impedance of about 40 to 50 ohms. See details in the enclosed documents or on our website. The fish aren’t biting, and in her boredom the lady notices that the vertical distance between a crest and a trough of a water wave passing the boat is one-quarter the height of the boat. A woman competing in a fishing tournament sits in a 6 meter long fishing boat that is 0. Maybe someone can clarify: I hear stories that the Hustler CG-144 2 Meter whip is also usable as a 1/4 wave for 10 Meters. 5/8th Wave Antenna Gain. Good Vertical Antennas • A straight quarter-wave (Best) -λ/4 ~ 125 ft at 1830 kHz with THHN • Inverted L (Good) -Go straight up as high as you can with a wire, then bend the remaining wire to run horizontal to resonate it • Tee vertical (A bit better than L) -Like an inverted L, but the top is extended in opposite directions. 66 factor the lines will be too short to run to the center of the square (where the phasing box should be) with a quarter wave. In the perfectly matched system, the SWR is 1:1. AEcreative 10-160 Meter Amateur ham HF Band Radio Wire Loop Antenna Balun Unun DIY kit T200-2 Type 2 Iron Powder ferrite toroid core 16AWG Enameled Magnet Winding Wire 3. The use of an antenna analyzer would be a good idea if you have one, but if not, then use your trusty swr meter. tube above the 20-meter trap. WORKMAN 104 VHF/UHF SWR Meter; Antenna Parts; Ground Plane Kits; Instructions. After a lot of research, my choice is the Comet Original CHA-250B HF/50 MHz Antenna. That said, beyond 30m, it becomes impractical to stick up a 1/4 wave vertical or delta loop, and you need a bagfull of wire to cover the various bands. The antenna design can work with any band, provided that a support of sufficient height is available. The result is in meters. This antenna, the Alpha Delta DX-B, is a trapped, quarter wave single wire sloper for 160, 80, 40 and 30 meters and has been installed at the 55' level and slopes to about 25' off the ground. is about 2. By John Portune W6NBC. The performance was excellent with. You'll find that the 5/8 wave antenna's angle of radiation is just 16 degrees making it an even better dx antenna. This has 4 x sloping radials at 45 degrees with a feedpojnt up at about 7 meters in the air. This antenna may be built as a 20 meter, 17 meter, 15 meter, 12 meter or 10 meter monoband vertical antenna. 160 meters 123 - 136 feet 80 meters 65 - 70 feet 40 meters 34. A quarter wave antenna with drooping quarter wave radials exhibits a nominal 50 ohms impedance, one reason for the existence of 50 ohm coaxial cable. A few years ago, I acquired a multiband commercial antenna called a half-sloper. new at ac6v. Two 75-meter whips were almost three S-units (about 18 dB) below a half-wave 75-meter dipole (no wonder, since a 75-meter half wave dipole is 130 feet compared to the 16 feet of the two whips). The frequency is tuned to GPS range, 1. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. #3 -- Two-Meter Full-Dimension Bobtail Curtain A full-sized bobtail curtain is really easy at two meters. 9 out of 5 stars 16 $45. Unscientific Observations of Verticals At our home, an old Hy-Gain trapped quarter-wave vertical for 40-10 meters was erected in 1961. W WVH transmits time and frequency standard signals from Kauai, Hawaii on 5, 10 and 15 MHz using separate arrays of two half-wave vertical drooping-ground-plane dipoles spaced a quarter-wave-length apart. These can also be used to seek information. This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen. I used it at a “Jamboree On The air” station,. Verify that the half-wave plate rotates the input polarization by 90 o. a quarter-wave vertical), the size of the ground plane does not matter (e. The large diameter yields broadbanded coverage of the 80 Meter Band. Also, an effective ¼ wave vertical needs a lot of ra-dials to make it efficient. This will give you a general idea of how they work: If you take an 80-meter 1/2-wave antenna and feed it in the middle, the impedance is around 72 ohms and is a very close match for 50-ohm coaxial cable. Half-Wave Dipole for 11 Meters (by 56FL114, Pete) A Simple and Certainly Working Antenna Solution. Today, I’m going to show you how you can easily build a homebrew 2 Meter ¼ Wave vertical antenna for under $10. is about 2. " Talk about a theoretical question. A half wave dipole’s radiation pattern is very broad making its installation. The impedance of this dipole at 40 meters should be about 12 ohms. The stand is plenty stout to handle the 23. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. Dipole length in meters: 143 / frequency in MHz These are only approximate values. In the quarter wave grounded vertical antenna, which consists of a quarter wave vertical element, the ground takes the place of the missing quarter wavelength. 8A and open-circuit the top dipole opposite the feed point. wave vertical 9. By Mike Higgins, K6AER. VK2PRC Quarter wave vertical, stationary mobile antenna for 20M Band Build this simple 1/4 vertices for 20 meters in a few minutes. Loaded Quarter Wave Antenna Inductance Calculator Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. A quarter wave antenna with drooping quarter wave radials exhibits a nominal 50 ohms impedance, one reason for the existence of 50 ohm coaxial cable. 5 feet 30 meters 24. An unloaded quarter-wave vertical antenna has a radiation resistance of about 35 ohms with negligible ohmic or conductor loss, but ground 15 and 10 meters. the quarter-wave vertical element. a quarter wave vertical at most frequencies. Also a full-size quarter-wave. with a Hewlett-Packard vector impedance meter. 5Mhz to 50Mhz on non choke balun version). It's an 1/8 wave vertical on 160 meters also. The fish aren’t biting, and in her boredom the lady notices that the vertical distance between a crest and a trough of a water wave passing the boat is one-quarter the height of the boat. In the quarter wave grounded vertical antenna, which consists of a quarter wave vertical element, the ground takes the place of the missing quarter wavelength. We can distinguish three field regions where the electromagnetic wave develops: reactive near. Stainless Terminated Folded Dipole T2FD 10M~40M 33' 20, 15 and 10 meter bands. This could be 50 ohm types such as RG58, RG8X, RG8, RG213, or 75 ohm type such as RG11, RG59, RG6 or even 75 ohm twin lead. 06 meters telescoping fiberglass mast (MFJ brand). Listed under the Antennas/Vertical category that is about Vertical antennas plans. Given that a quarter wavelength on 7100 kHz is just a smidgen over 10 meters, it seemed that not much loading would be necessary to make a 8 to 9 meter conductor look like a 10 meter one to radio frequencies. Whether you're operating on 2 meters or you work in the 1. The SWR meter has to fall on a 1/2-wave point on the coax run. 8 mhz) 1/4 wave inverted "L"(50’ H x 74’ L @ 1. For half a dozen reasons, antenna designers start off with a 90% quarter wave when using thin (#10 or smaller) wire. You can drag the antenna anywhere. It has a 4 MHz bandwidth with an SWR of less than 2 to 1. In fact, the new Penetrator 500 should be marketed as a 12 meter 5/8 wave antenna, because that is exactly what it is. 150 Mhz ) amateur radio band. The quarter wave vertical antenna is usually the simplest to construct and erect although I know a great many people who would dispute that statement. There are presently 10 antennas on it and all the feeds and control lines come off at ground level and go underground to the house. The fish aren’t biting, and in her boredom the lady notices that the vertical distance between a crest and a trough of a water wave passing the boat is one-quarter the height of the boat. The wire is exactly 66ft long. Specifications: • Full band coverage on 20 or 17 or 15 or 12 or 10 meters with SWR under 1. Imagine it as being the other half of a dipole. The 40-meter section consists of a 36 in. KL7JR 10/12/15M HOOLA LOOP. 3 to 29 MHz. • Fasten the choke to the quarter-wave support pipe below the shorted end of the quarter-wave feed section of the antenna.