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Yes, you can mount the amp in a location for better serviceability at a slight penalty in the system noise figure. 8' of coax equals about 1/2 dB additional loss before the amp. I had to do something very similar. I put my pre-amp at the bottom of the 10' gable-mounted mast so I can swap it (something I do for testing purposes) without having to bring down the 10' mast with an 11' long stretched 91XG on it.
As far as an amp, first need to know if that nearby low power (UHF 40) is on the air or not, also what antenna do you have and which way is it pointing?
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