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But I did put a 50' coax through my window as a direct run from tv to antenna with no splitters as a test for wiring issues, I received the same channels with no changes.
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You probably need to do that with the preamp at the antenna and its power inserter. Your UHF signals are calculated to be quite weak and a preamp is going to be mandatory. It's going to be a balancing act to select an amp that improves your system noise figure without causing compression or IMD from the strong, local signals.