You'll have AC power and more.
You can google Wireless HDTV to find the current solutions but most find it more money than they expected!
I was looking at an LG plasma tv. I'm looking to mount it above my fireplace (I don't use the fireplace). I'd like to not have wires either outside or inside the wall. I was reading that the LG has a box that I could connect my dvd player and cable to on, say, a bookshelf by the wall and it would wirelessly send the signal to the tv. Is this possible and how well does it work? Especially since that box would be under and to the right of the tv Thanks!