I already explained all of that.
Default ground specs were used. (0.005/13 over Real/MININEC)
The ground plane antenna had four 1/4 wave horizontal radials 4 feet off
the ground. The bottom of the vertical dipole was also 4 feet off the
ground.
Yes, the vertical dipole had greater field strength at low levels, but
as I stated the difference was only a few degrees ... the max was at 17
degrees for the vertical dipole and 23 degrees for the ground plane and
there was barely a couple of tenths of a dB difference at the two maximums.
You can easily model this yourself (I used EZNEC Pro/2+ v2 with NEC5) if
you don't believe me ... but I suspect that you already have in the past
so I don't understand the questions.
Dave AB7E
On 1/13/2026 1:21 PM, Jim Brown wrote:
On 1/13/2026 11:09 AM, David Gilbert wrote:
but the maximum gain is almost identical.
How did you model ground loss? What radial system? Any vertical with a
current maxima near the ground will need a return, and current in that
return has some loss.
Once you've done all that correctly, save the vertical pattern of one,
then compute the vertical pattern for the other, and add the saved
plot to it. The half-wave antenna will have greater field strength at
low angles, and depending on your soil, may have less ground loss.
http://k9yc.com/AntennaPlanning.pdf
73, Jim K9YC
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