One of the essential accomplishments of a dense radial system is to shield
the vertical section E-field radiation from an otherwise quite penetrable
and lossy ground in the fairly close area around the bottom.
The addition of more radials improves the shielding of the bottom of the
vertical section from the ground and the dielectric (and loss) of the
ground. Frozen ground does not present the same dielectric as normal
(thawed). With less shielding the vertical section will see the dielectric
change when the ground freezes, and will tune differently.
73, Guy.
Adding more radials stopped it and the
> antenna was stable summer and winter. I believe it has nothing
> to do with the trees but ground soil conductivity or lack of
> same.
>
> 73 Rich KL7RA
>
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160 meters is a serious band, it should be treated with respect. - TF4M
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