Digital Tv tuners can develop -Digital Glitches- that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
www.wchstv.com/DoubleReScanAlert.pdf
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The Tv Must Channel Scan for the , ATSC-Digital Broadcast Tv Stations/Channels.
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Please make and post 2 Tvfool reports using the correct address and make the antenna heights above ground 10 feet and 25 feet antenna heights above ground.