I was just checking out the Tablo item that Carpediem mentioned... I wonder if I could locate the antenna, Tablo and USB drive at a friend's that has great OTA reception and then view the programs at my home that has poor OTA reception.
Probably not worth the hassle. You'd have to pay extra for this functionality (remote viewing) and you'd be eating into your friend's bandwidth, which might be an issue if they have data caps.