Looking for coax input and outputs that send and recieve signal in a home

This house was built with a few issues. One of them being that 2 of the 5 rooms were built without a coax wall outlet thing.

Anyways, my parents were thinking of just making some small holes and putting a wire through them into my brothers rooms (both of them got the rooms without the coax).

I'm trying to see if I can not let them make a hole in the wall.

what I'm looking for is something that plugs into a wall outlet for electricity, and that device would have something that plugs a coax into it. The other end of it would be something that plugs into a wall outlet for electricity as well, and has a little coax wire coming out of it to plug into a tv.

I have something like this in the house, but only one. Not sure if it is what I need, but here:
http://i.imgur.com/g00Ep.jpg

IF that's right, then I'll need another one.

I remember vaguely hearing about something like this for ethernet cables, wondering if there is something like this for coax.

Of course, any other suggestions are fine as well, just a thought I put up there. So, can anyone help me out?