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I think a pre-amp is beneficial in your case. It overcomes any of the signal loss that occurs after the amp (like long cable runs, splitters, etc.). It will give you some extra margin for error (like interference, seasonal changes, stormy weather, etc.) and make your overall system more robust.
It's some added peace of mind for a modest cost. It's really not that much if you consider that the average monthly cable/satellite bill is about the same amount of money.
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