The HDP-269 may in fact help. Make sure the system is grounded properly as that particular pre-amp is sensitive to failure from static build-up. Of course, proper grounding is vital to better help the entire system avoid lightning strikes by draining off static build-up.
If adding the pre-amp doesn't help, try raising/lowering the antenna in 6 inch increments to find the best sweet spot for the problem channels.
Trimming or removing trees should be your last resort
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