Over the air-tuners...a littl hard to come by, but I think I found one. I think it's only for Windows, but try
Artec. It's USB based, and about the size of a flash drive. Just attach an attenae via the coaxial cable, pop this baby in, ad you're ready to go. Best of all, it'll pull in HD, too. $89 with free shipping. I'll look into this more a little later.
Mike