I lost the guide on my Pioneer Kuro, was using a Buffalo zip code.
Changed things to Postal code and guide did come back up from what I assume was a Canadian carrier. Too bad that it will all be dropped next year.

Hate to have to find some sort of on line guide and have to run my antenna through my PC to make things look and work well (if that will even be possible) Those small dongles available for recording off air TV are supposed to have a TV guide. But they are not very good, at least the one's I have played around with.