UPDATE: Thanks everyone for the ideas! This was an area I knew very little about but now I can talk with a little more expertise about it. Much appreciated!
Visited my dad this weekend and he wants to pipe some internet radio he's found down to a tuner on quite a distance away in the house.
He uses computers for only very basic things: e-mail, getting the Post crossword, checking Yahoo!, checking recipes, etc.
There's currently one computer in the house (no router).
My initial suggestion (without any research whatsoever) was to get a wireless router and a netbook for downstairs near the tuner, but he initially wasn't too keen about having another computer down there.
Anyway, is there any computer hardware that could magically pipe the audio output from the computer down to one set of (RCA) audio inputs on the tuner? Wireless isn't necessary but it probably would be easier.
Anyway, thanks for your suggestions!
UPDATE Thanks everyone! Voted up all of your suggestions now that I have 15 rep. Much appreciated.