Thanks for the photos. I would like to give you an idea that would guarantee an improvement, but I can only suggest things that might help:
1. Raise the antenna
2. Try a different preamp
3. Insert a UVSJ before the preamp to block any VHF interference
4. Consider the possibility of cell phone interference
I realize that you can't do much about the trees and the mounting locaton.
Maybe ADTech can suggest something I overlooked.
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