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Sounds like the preamp is defective. The mast mounted part of the system must be bypassed to confirm this. I would suggest replacing the pre-amp with a Channel Master distribution amp if this turns out to be the case.
I'm guessing you are using the Winegard HDP-269 which is prone to failure from static build-up on improperly grounded antenna systems. (Happened to me in less than 2 weeks & read of others having issues with the same model)
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