If you have a laptop you might consider something like the:
"Pinnacle PCTV HD Pro Stick- HI-DEF TV Tuner"

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2485646&CatId=1427
(I've never done business with these people but they have nice pictures on their web page)

Don't know how good they are..