Good morning,
I recently changed my elevated 160 meter quarter wave vertical with 8 full
sized radials to having only 1/8th wave length radials and only four of
them. It is working great. So I thought adding four more radials might
improve things.
But before I went to all the trouble I decided to model it and see if there
was a difference in performance of the 8 radial version compared to the 4
radial system.
I use a modelling program called Antenna Model. The result of the
comparison is this:
The 4 radial system showed a gain of 0.92 dBi with the main lobe at an
elevation of 20 degrees.
The 8 radial system showed a gain of 0.93 dBi and an identical elevation
pattern.
My question is: Why is the gain figure so low? A dipole exhibits 2.14 dBi
gain. Why doesn't the vertical show gain?
And lastly, I think these results tell me it isn't worth the effort to add
four more radials.
Your thoughts?
Thanks & 73,
Dave, K4TO
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