http://www.hdtvprimer.com/ANTENNAS/fixes.html
Scroll down to the section on "Short delay multi-path"
Additional resources from Ken Nist's HDTV Primer site which may provide insight:
http://www.hdtvprimer.com/ANTENNAS/glossaryR.html#trees
http://www.hdtvprimer.com/ANTENNAS/g...l#interference
http://www.hdtvprimer.com/ANTENNAS/siting.html (Scroll down to "Trees and UHF")
An excellent (and sometimes humorous) read regarding UHF and trees was published in 1990 by a British "aerial" installer in the trade publication "Television". A reprint is available here:
http://www.wrightsaerials.tv/referen...-reception.pdf Although written back in the analog-only days, the situation is much the same with one huge difference. A lousy analog signal was often viewable and the viewer just accepted it since they could figure it out. However, the same reception problems that caused a "lousy analog" experience will completely spoil digital reception as the "computer" in a digital tuner can't correct the numerous data errors and reception fails, either partially or completely, with the infamous "Weak or no signal" message. Please note that the terminology used was particular to the British market during analog days, so some information might require translation to common terms used on this side of the Atlantic.