Moderator: JR Moderator
- Posts: 7382
- Joined: Saturday, 12 June 2010, 19:05 PM
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- Radio: Uniden Washington
- Antenna: Avanti Sigma II
- Name: Greg
- Location: Baltimore, MD
23 AM "WORLD WIDE" 38 LSB
Strong Supporter of America's Original Homeland Security Act
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Texas Ranger TR-696FD1C
Avanti Sigma II
Hustler 102" SS Whip and Hustler Ball Mount
- The DB
- Posts: 461
- Joined: Friday, 12 August 2011, 21:17 PM
- Radio: Galaxy DX 55HP
- Antenna: ¼λ Mobile Antenna.
- Name: Steve
- Location: Gateway City in the Show Me State
They are also unidirectinal antennas, peak gain is about 45 degrees back around the loop from the tip.
These antennas don't work very well above dirt, so if you make one of these, built it on a large sheet of metal, the larger the better. A flat metal roof on a building is the best.
Let me say this again, you need lots of flat metal under these antennas for them to work well. Radials on dirt simply aren't enough, think sheets of metal, large sheets of metal, a minimum of a 20 foot by 20 foot area at CB frequencies. Seriously, don't hold back, at all. If you can't use sheets of metal, lay down lots of chicken wire and make sure the strips of chicken wire are all connected very well.
The ground is a key functional (and very active) part of this antenna and for this antenna design to work well it needs to be very conductive, much more so than with most other (including ground plane) antennas.
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