An antenna connection requires the DIGITAL tuner to recieve local TV channels, and the Cable Box only sends out an ANALOG Channel 3 or 4 signal. It also can connect to the TV set using the Low Def Composite cables -
Or the High Def Component or HDMI cables --
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From your description it points to the Digital tuner can't store the Antenna signals, but the other choices work fine.
Now, did you activate the FULL AUTOPROGRAM that scans both the Digital and Analog channels?
If so, your digital tuner is Dead on the DM module.
Ok, the DM module contains the ATSC digital tuner.
Part number -- 934C152006
Hmm, the big suppliers seem to be out of stock right now....
There is one place that's in stock but....it doesn't come up in Google.
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Click the dollars button, and copy that part number into the part box and hit enter.
They look like they are the only ones that have it in stock.
If you have any questions, just ask
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Tips are greatly appreciated !