20 meter

464 links - and 5 categories

160 Meter Antennas at W8JI - 160-meter vertically polarized transmitting antennas center around this 200-foot tower
[ Hits: 3964 | Votes: 1 | Rating: 10 ]
Building High Power, High Q, Loading Coils - This page describes the loading coil (inductor) that W8WWV built for my center-loaded 160 meter band (1.83 MHz) vertical antenna.
[ Hits: 6885 | Votes: 5 | Rating: 5.4 ]

W5GI Mystery Antenna ^pop - W5GI Mystery Antenna is a multi-band wire antenna that performs exceptionally well even though it confounds antenna modeling software. This antenna covers 80 to 6 meters with low feed point impedance and will work with most radios, with or without an antenna tuner. It is approximately 100 feet long, can handle the legal limit, and is easy and inexpensive to build. It is similar to a G5RV but a much better performer especially on 20 meters.
[ Hits: 139382 | Votes: 123 | Rating: 7.55 ]
Helical loop antenna for 20 meters - A Helical Loop Antenna for the 20-meters Band
[ Hits: 6070 | Votes: 3 | Rating: 5.67 ]

VK5AH -HF 4 Bander dipole ^pop - A multiband 80-40-20-15 meters dipole wire antenna that can be extended to cover 160 meters too.
[ Hits: 54043 | Votes: 22 | Rating: 6.68 ]

Shorty Forty Antenna - Short dipole antenna for 40 meter ham band. Can be put up in the space required for a 20 meter dipole.
[ Hits: 12445 | Votes: 8 | Rating: 7.74 ]
Trapped dipole for 40-80-160 meters ^pop - Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe by W8NX
[ Hits: 96966 | Votes: 119 | Rating: 6.24 ]

80/75 Meter 4-Square Array - This array has been in use since 1989. The SWR from 3.5 to 3.9 is below 1.5:1. The F/R of the array is 20dB average and with some signals even better.
[ Hits: 2286 | Votes: 1 | Rating: 10 ]

Hex Array - 80/40 Meter Vertical - This page describes a homebrew 80/40 meter trap vertical antenna. Includes an interesting antenna raising system that allow easy setup and tuning.
[ Hits: 7624 | Votes: 2 | Rating: 5 ]

40 meter shortened dipole - M0MCX - Interesting little project with a couple of loading coils by M0MCX
[ Hits: 14307 | Votes: 11 | Rating: 6.55 ]
20 meters Cage Dipole - Cage Dipole is based on the fact that a wireframe does emulate a tubing of the same diameter, supposed that the wires in the frame are close enough to resemble a solid surface.
[ Hits: 12654 | Votes: 6 | Rating: 5.33 ]

End fed halfwave antenna and matching unit - One is an EFHWA for 20-40 meters, and the other is a matching unit for the antenna by n0lx
[ Hits: 10398 | Votes: 5 | Rating: 5.4 ]

G5RV vs. Ground Plane on 80M - Comparison tests by WF7T of a G5RV antenna vs a GP antenna on 80 meters band
[ Hits: 1549 | Votes: 3 | Rating: 7 ]

Hex Beam by K4KIO - This site provides guidelines to build a G3TXQ broad band hex beam RF antenna for the 5 ham radio bands, 20, 17, 15, 12 and 10 meters. The G3TXQ hex beam is a new development and actually easier to build than the classic hexbeam.
[ Hits: 6728 | Votes: 13 | Rating: 8.77 ]

LU9DPD Windom dipole - A multiband windom dipole antenna for 80 40 20 10 meters, feeded with a home made 4:1 balun, in spanish.
[ Hits: 5342 | Votes: 5 | Rating: 6 ]
EC2APU multiband wire antenna - Wire antenna for 10-15-20-40-80 meters band, with many drawings and description in spanish
[ Hits: 6598 | Votes: 6 | Rating: 5.17 ]

HS0ZEE Antenna Tower Installation - Pictures and history of HS0ZEE 37 meters antenna tower installation with a cubical quad on the top of this tall radio mast.
[ Hits: 2475 | Votes: 6 | Rating: 8.67 ]

4 element yagi for 20 meters - Pictures and plans of a 4 elements yagi beam antenna for 14 Mhz
[ Hits: 13793 | Votes: 26 | Rating: 4.33 ]
5 element yagi for 20 Meter band - Picture and construction details of a 5 element 20 meter monobander
[ Hits: 5418 | Votes: 9 | Rating: 5.33 ]