Disconnect and Remove the , amplifier unit , power injector , power supply.
As a Test to prove reception.
Run a New Continues Length of Coax from the antenna through a open window or door direct to 1 Tv , No couplers , No splitters , No coax ground coupler , No etc. .
Digital Broadcast Tv Tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Do Double Rescan ,
http://www.wchstv.com/DoubleReScanAlert.pdf.
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