You cannot combine or diplex cable and OTA sources on the same coax without getting interference. Cable and OTA cover the same frequency range.
To do what you want - pull seperate cables for each and use an A/B switch ( or if your TV supports different coax inputs do it that way). Or use a VCR on the cable and pull the OTA to your OTA HDTV tuner.
You CAN put antennas on your owned and/or controlled property...
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