NEC is good with wires above .05wl, so I just modeled a low
dipole.
Adding "ground screen" improved low angle signal (25
degrees) almost one dB.
It improved 90 degree angle signal 2-1/2 dB.
This was using medium ground in the model, and a 35 ft high
dipole. Most of the time I saw slightly more than that over
my soil, so the soil below my antenna may have been worse
than medium or the model just a bit generous. I also used an
"Inverted Vee dipole" with lower ends which may have come
into play. I'm sure that would aggravate losses.
73 Tom
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