Advertisements It's possible that the WDTN fixed their streams (PSIP data) to identify everything that is coming off their stick. Guide data isn't mapped to actual RF frequencies, only virtual channels and call letters. Your Tivo needs to make that map by scanning the airwaves and identifying what each stream is, and mapping those streams to a program guide. Your Tivo will continue to wait for a signal on the old frequency unless it finds a reason to rescan for channels. It might just as well think there was a power failure at the old station's transmitter and is simply waiting for the station to come back on-line. Your tivo rescans during guided setup. It also scans when you tell it to. In 18 months time, when all these stations move to UHF 31, you'll have to rescan again. I don't think "re-scanning" is part of a nightly update.