The impedance of my 160 meter vertical 50 feet or less from
a few large pecan trees was about 5-10 ohms higher than the
impedance of identical verticals in open pasture.
The impedance of that vertical went down when two trees
nearest the vertical were removed.
I have no idea how that changes the FS, but since a tree is
lossy (compared to a steel or metal structure) it probably
isn't helpful. By the way, my 300 foot tall tower 400 feet
or so from the 160 array affects the pattern quite a bit
when it isn't detuned. It doesn't add loss, it just changes
where the power goes.
73 Tom
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