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The claimed 5 band performance is obtained:
- with a slight slope, 6m one end & 4m the other, longer 2/3 section highest;
- with about 20ft feed line.
Do not put a choke or common mode rejecting 1:1 unun (balun?) at the feed point. I got very high swr on all but 20m and 10m with a choke there.
However: I have yet to try with a broadband choke (I used an air-core 'ugly' balun).
So I foolishly succumbed to the lure of an air-core 'ugly' balun and wound one close to the feedpoint. This ruined the whole thing. Just don't do it. Two theories: it's too narrow band which is true but where is the band? the antenna needs some feed line as an impedance match to 'soften' the resonant peaks. This works like a resistive divider and implies some loss in the feed coax, but saves having to use an antenna tuner and is no less efficient.
17m shows swr 1:1. This looks unlikely to me, but the other bands are reading ok on the same radio, so maybe i'm just lucky?
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