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I have my CATV and DTV combined outside my house, and then diplexed at the DTV reciever/cable box. Can I piggy-back the OTA UHF/VHF signal in the future on this same incoming single cable. If yes how would I diplex the UHF/VHF OTA frequencies from the CATV frequencies? If no why not?
 

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Generally it is a bad plan to attempt to diplex OTA and CATV signals. For one thing many CATV channels and OTA channels occupy the same frequencies, for another if your lash-up allows some of the CATV signal to leak back to your antenna you can invoke the wrath of your CATV vendor, the FCC and the FAA (some CATV channels operate on critical FAA frequencies).
 

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I'd think this would be worse than combining two OTA antennas without filters. You'll be combining signals for some overlapping channels.



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Best practices use separate cables for each different signal.


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