At the very least you would need twisted pair, such as CAT5, and then you would need to send A/V over it, rather than RF signals. Can a new co-ax cable not be fished up (or down) the walls, and run through a basement or attic? How about through a wall to the exterior of the building, and back in again? Or through a wall from another room? Another option is to buy plastic "track" or "raceway" and run it above the baseboards from one end of the room to the other. If there are obstructions, perhaps it could be done at the wall/ceiling junction instead, or, again, from another room. A well-known brand is Panduit. If you end up having your source electronics in an adjacent room, you can control them with an accessory such as the "Powermid" system from X-10. Here's another option: There are video repeater systems available. They are actually designed to send A/V signals from one room to another, through a wall. They are composed of two units: a transmitter and a receiver. They both have stereo audio (red/white) and composite video (yellow) jacks. You connect your cable box (or VCR output) to the transmitter, and connect the receiver unit to your TV's input. The downside is that, as far as I know, there is no HD version of this; SD only. Consider all possibilities: I have on occasion spent a couple of hours or even more, assessing options, before picking up a tool and starting the actual work. You need a plan first. Good luck!