Sounds like a tough situation w/the trees and the distance. If you dial the antenna in with a compass specifically to 104 degrees, can you get anything at all from the PBS station? Even if you do I'd imagine a breeze blowing through could be an issue, breaking up any signal you may be able to get.
Can you add height w/a mast?
What about mounting as far away from the trees as possible?
Also, what about a rotor? They're not convenient when surfing channels, but if you know what you want to watch, you can point accordingly.
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