Yes, it is possible. Think of it as a guest house on a single property or the far end of a very large home.

I can currently see wifi signals from at least three homes around me. They are weak, but they are present. If we both installed equipment to extend their network then it ought to work fine in my house. A wired connection would be ideal but there are wifi systems also.

The Xfinity modem is also your router and is responsible for distributing the WiFi signal to all the WiFi devices in your home. You, therefore, should place it in a central location somewhere where a coax outlet is available.

Only one cable was terminated and connected. I terminated the remaining cables and labeled the rooms they went to. Also have an antenna in the garage attic.

It's possible that the OP's house is the same. But, the fact that this is a pre-owned house and someone installed a splitter in the panel with 4 COAX cables connected to it makes me assume that the cables were activated and used by the prior resident. Xfinity would not have visited the house to disconnect anything.

With all this information, i'm lost, what's the OPs question again?

OK, mine install was couple years ago in my area. Be warned. :undecided:good luck when you have actual problem. Luckily set up service rarely has problems..