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Amazing. Four posts to NOT answer the question.
Mr Pants,
Your amplifier is not overloading. The antenna you have is a fair UHF antenna and it's design and capabilities are generally appropriate for the "problem channel" that you have. That said, it is lacking a feature that is likely contributing to your one-channel problem, that is, something to improve its directionality and focus.
Your problem is best described as a "single-frequency multi-path" fault. There is a set of factors that is causing that one channel's signal to be oddly reflected or distorted before it gets to the antenna. That might be those trees, the power lines, the house across the street, a nearby tower or other structure, or an echo produced within your attic.
As your antenna both lacks a reflector and exhibits a very wide reception beamwidth, it is not capable of rejecting interfering/reflecting signals that are the likely cause of your single channel problem. Short of buying a different antenna with different performance characteristics, you really have one option available to you: Move the antenna somewhere else and try again.
I run into this issue with callers just about every week and the solution I've suggested works very well. In your case, try several different spots in the attic. If improvement isn't made, try the antenna outdoors in several locations.
Good luck!
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