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.