I might be buying a tv for another person in the house (for Christmas) so I can get the one back that I like to use in my "office". I know the signals change early next year, so what do I need to look for when shopping for a small portable tv? We have cable but will probably want to take this one with us to places where we would need to use an antenna. If the ones for sell can detect the new digital signals, will the advertisement say that? Or is the advertisement supposed to state that the tv will not pick up the new signals?