Topband: Trees and RF

[Jan Erik Holm]

kl7ra at ptialaska.net wrote:
>> Folks with a better understanding of the reasons for the frequency
>> excursion might offer an explanation. I just vary the vertical wire
>> length to fix and live with the required adjustment.
>>
>> 73, Gary NL7Y
> 
> I may not have a better understanding but I lived about 20 miles
> from Gary's qth with a full size quarter wave vertical for 160
> that did the same thing. 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
> 
I have a 97 ft top loaded vertical partially supported by a tree,
60ft in the tree and 40ft above. I have 250 radials on the ground
each about 160 ft long. I see absolutely no change in anything
from summer to winter, rain or shine or snow or whatever. IMO
the antenna works very good.

73 Jim SM2EKM