Home Network :: Cable TV And Powerline Networking

I would like to set up a TV in my spare room which does not have a coax plug. Because of the set of my house running coax cable to this room, although possible, is something I am hoping to avoid. This is because if I was to run the cable on the outside of the wall it would get in my way and it will cost $300 to $400 for a tech to come out and run it through the wall.My first thought was to set up an old computer in my living room and have it connect to a cable box. Then I would send the video signal over the wireless network. The problem is that I cannot change channels on the other end. I have been reading up on power-line networking and it looks like a good option for my problem. I was hoping to find a device that will allow me to plug coax cable into it in the living room send the signal through the power-line to another device in my spare room where my TV receiver would be located. Is there anything like this out there on the market? If not are there any other options I can look at?