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If that cable feed was your local friendly CATV service, they use a different DTV transmission standard than that used for over-the-air DTV broadcasters. So it's not surprising that it didn't find nuthin.
Over the air DTV tends to work better if you have a directional antenna, indoors that's feasible only for UHF. Otherwise, for VHF DTV, you may need a rooftop antenna, as indoor antennas would just be the same as old fashioned rabbit ears (but DTV tends to be fussy to receive with such).
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