Sharing cable company coax into house with OTA antenna feed: diplexer? (nope. shared freqs) - AVS Forum | Home Theater Discussions And Reviews
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Old 03-07-2013, 04:06 PM - Thread Starter
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I think this is a pretty basic question, but I don't want to mess things up!

We have cable/telephone/data from Comcast, and want to cancel the cable service. I'd like to put up an off air antenna to get some OTA signals, and am wondering about combining the coax coming off the antenna with the cable company coax coming into the house. I'd then like to split the signal in the house and send the antenna signal upstairs to the TV and the Comcast signal to their box, which we would continue to use for telephone and data.

Is this a standard application for what I think are diplexers, one outside the house where the two coax signals would be joined together, and one inside the house where I split them again? If so, are there different types of these things that I'd need to get? Feel free to post a link, by the way.

As I said, I think this is a pretty simple question, but with the telephone and data service at issue here, I don't want to mess it up. Thanks.
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Old 03-07-2013, 04:16 PM
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Nope, can't do it.

Keep the cableco signals on a completely separate coax run from your OTA signals.
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Old 03-07-2013, 04:55 PM
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++1 CATV and OTA share many of the frequencies.


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Old 03-07-2013, 06:16 PM
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If you cancelled Comcast altogether you could use the same pre-existing cable already in place, although you would have to examine amplifier and splitter issues. But you cannot combine cable and OTA antenna signals as they interfere with each other. So you will have to run new cable for an antenna, and possibly add a preamp.
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Old 03-09-2013, 05:59 AM
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Just curious what is the difference in price of having internet and phone versus internet phone and the most basic cable ?
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