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Bad connections and bad coax are the first situations to check.
Water damage of connections , water damaged coax.
The coax and connections can look good and still be bad.
As a Test.
Run a continues length of NEW coax that has the compression type connectors , not the old crip type connectors , through a open door or window , direct to one Tv.
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Tvfool shows the Real channels that are transmitted and received , and the , virtual numbers.
KQED Real UHF Digital channel 30 , virtual number (9.1) , PBS .
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