I have no idea where your existing TV and wall plate is. I mounted our new SensarPro on the hollow interior wall (backing onto bathroom) below the TV and ran new coax & 12VDC wire up to where the original TV plate was on the ceiling. Needed two coax cables to the new SensarPro and two back to the old location (total 4 coax cables to/from) - one pair for living area TV and one for TV in bedroom. I went to a local AV shop and had custom RG6 coax lengths made up using compression fittings. I mounted a standard blank wall plate over the hole where the old wallplate used to be. If I were to do it over, I would have mounted the Sensarpro on a wall closer to where the antenna is.
