Topband: Trees (not the N6TR kind)

[Tom W8JI]

> I recall comments at a hamfest talk several years ago from Roy, W7EL, that 
> his two-element 40m vertical array appeared to have an unintended null in 
> the direction of a stand of evergreen trees not too far away from his 
> antenna system.  While this is two octaves above 160m, it at least 
> indicates the possibility of absorption problems.  In all likelihood, 
> different tree species at different times of year could introduce a lot of 
> variability.

That was a rather dense stand of trees.

A few trees a reasonable distance from a LF antenna are not going to do 
anything observable. A single tree at 2 GHz can mean 20-40 dB. It has 
nothing to do with resonance, but rather how much the electric field is 
killed by the resistors sticking up in the air.