Our club is planning to use an elevated vertical for fd 40 m. I have been
tasked to use EZNEC to determine length of the vertical and radials given a
feedpoint 10' above ground.
EZNEC reports good vswr with a 4" alum pipe vertical element 33.1' and radials
32.5' of #22 wire.
However the elevation pattern and gain using real ground shows virtually no
difference with 0,2,4, and 8 radials. The source impedance jumps from highly
reactive with no radials to 50 ohms mostly resistive using two radials and
lowers a bit using 4 and 8 radials.
The pattern and gain being nearly identical no matter how many radials are use
(including none) has me wondering if I have something wrong in my model?
All comments appreciated, please.
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