Discussion
Why does wet foliage attenuate more than dry?
Answer: C
Liquid water has a large loss tangent at microwave frequencies, so a wet canopy absorbs considerably more than the same canopy dry, and the effect can amount to several decibels on a short path through trees. Size change and screening are not the mechanism, and reflection is a minor contribution. That the same obstacle behaves differently according to the weather is a reminder that a path survey made in one condition may not describe another.
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