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Signal strengths at your location are strong.
Some possibility s
A bad antenna and connection and amplifier and power supply.
Bad coax and connections.
A bad tuner in the Tv.
Both bad , antenna and Tv.
Substitute antenna and Tv , first one way and then the other.
The Tv Must Channel Scan for the Digital Broadcast Tv stations/channels.
Not cable Tv channels.
Try doing a Double Rescan to clear tuner.
www.wchstv.com/DoubleReScanAlert.pdf