I hace Xfinity coax in the house. I am using their internet...but want to put up an OTA antenna. Can I use the same Coax like they do with thier cable tv signal? Or do I need to run a new cable for the OTA tv antenna?
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What do you mean use the same coax cable? The Xfinity cable connects to their service out on the street, it's not connected to an antenna. You need to have a different connection for the antenna.
Yes, if you don't sub to comcast's TV service, you will need to use an antenna. The physical conneciton is the same, but you still have to connect an antenna.