The best gain you can get with 1/4 wave spacing is 3 dB.
With closer spacing you might be able to get 4.5 dB. OTOH,
the wider spacing will probably give better F/B. On receive,
this might be more important than 1.5 dB of gain. You will
also get much wider bandwidth at the larger spacing, and
everything will be less critical.
Rick N6RK
Tom Osborne wrote:
> Hi all
>
> I built a couple of 2 el beams, one for 20 and one for 10.
>
> I just split the driven element, fed them directly with 50 ohm coax. and
> spaced the reflector at a 1/4 wave. It seems to be a good match on both
> antennas and the SWR is very low.
>
> I don't have any modeling software here, so what does it say about an
> antenna like that? I know the best gain is with a director a lot closer,
> but this way I don't need to mess with a gamma or any other kind of match.
> I like the KISS method of doing things. 73
> Tom W7WHY
>
>
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