While this worked OK back in standard definition days, today's USB Tuners are mostly HD so you're not quite there. I'd like to see about a 2GHz Core2Duo and a video card of the Nvidia 610 or better class.

It should be fine for audio but if you want some USB tuner it would be for your country. Since that was left out, I'll supply the best sellers on Amazon here.
http://www.amazon.com/Best-Sellers-Electronics-External-TV-Tuners/zgbs/electronics/3015428011

Look at those 39 dollar USB sticks.