How do you guys model the parasitic effects of
a tower? With its base in concrete, it is neither
floating nor grounded. Is there some sort of
modeling rule for such?

For instance, if a vertical with sloping radials
is mounted on a tower with the radials insulated
from the tower, the tower still has an effect.
If we model the tower as mininec grounded, it has
some extreme effects which may not be realistic.
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73, Cecil http://www.w5dxp.com