Sig290, welcome to the forum. The mod that you would like to do is something that many people have done. If your rig does not have an antenna jack in the basement, look behind the wall. You should be able to find a cable from the UDC and add a splitter and a coax connecter in your wall.
Then install an articulating arm and your TV and your good to go.
Post some pics when you do this mod.
Peace
Dave