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Not to get into the discussion of whether or not you need a preamp and a distribution amp, let me answer part of your question. You can isolate one portion of your antenna system from another portion as far as the DC voltage is concerned by using a DC Voltage Block. Winegard used to make one and I think Pico Macom does also. Less than 1 dB loss on the old Winegard VB1000 I have in my junk box. They look an F connector on one end and are threaded on the other end to accept an F connector.
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