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DDRR Antenna???

Help with installing an Antenna, or just choosing the right antenna to go with your radio, or your mobile.

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Bobcat
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DDRR Antenna???

Post by Bobcat » Thursday, 28 December 2017, 14:23 PM

I'm curious to know if anyone here has ever tried a DDRR antenna on CB?


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MDYoungblood
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Re: DDRR Antenna???

Post by MDYoungblood » Friday, 29 December 2017, 10:51 AM

Had to Google that one, interesting, if you try it make a topic. Looks to be horizontal polarity.

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The DB
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Re: DDRR Antenna???

Post by The DB » Friday, 29 December 2017, 12:28 PM

Actually, I know they don't look it, but they are actually vertically polarized. Think of the ring acting like a large capacity hat...

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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