[TowerTalk] Multiband antenna with non-resonant trap

[James Duffey]

Hans - Try:

"Designing Trap Antennas: A New Approach"  by Yardley Beers W0JF  Ham Radio August 1987"

He also had a couple of articles in QEX. A search on the ARRL periodical index should lead you to them.

You don't need the article though. The trap should be resonant at the geometric mean of the higher and lower frequency, trap = sort(floe*fhigh). The antenna length should be what a dipole is at this geometric mean frequency and the traps should be in the center of each leg.

There are other variations where the trap is not in the center of each leg. I think the QEX articles discuss them. - Duffey  KK6MC  
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KK6MC
James Duffey
Cedar Crest NM

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