[Antennaware] 2-element delta loop array close to ground

[Terry Conboy]

At 06:55 AM 2008-11-28, Pete Smith N4ZR wrote:
>I am modeling a 20M 2-element delta loop array with the apex up, 12-foot
>spacing and the bottom about 35 feet above ground, fed at a lower corner,
>using Multi-NEC and NEC2.  In driven/reflector configuration, it looks
>about like what I'd expect - 6 dBi gain and 14-18 dB F/B.  But in the
>driven/director configuration, there isn't much directivity at all,
>regardless of frequency.
>
>Does this square with others' experience, or am I messing something up in
>the model?

I tried this in EZNEC and get the same sort of results.  With a ~5% 
smaller director, the F/B is about 3 dB with 12 foot 
spacing.  Decreasing the director spacing improves the F/B very 
slightly: with 7 foot (0.1 wl) spacing, it's about 5 dB.

73, Terry N6RY