jz128,
Pretty much anything from the big box stores will work- it just has to have a digital tuner (will probably have it anyway). Your main concern would be finding one that fits in the enclosure you have now...unless you're just going to set it on the dinette or table. No "box" will be necessary with any of the new sets- the exception would be a small number of rv parks that supply them to their guests upon check in. The other exception is if you decide to get satellite (I never have...if it's not off the air or thru cable, I just do something else).