Quite possibly true if located far enough out that an omnidirectional antenna can't get them all. In Atlanta the NBC affiliate is VHF while all others are UHF. I discovered that a BIG (8' long, 6' wide, 4' tall) VHF/UHF antenna couldn't be positioned in such a way that it picked up everything... at least not on the Tivo (the built-in TV tuners work better). We ended up with a dedicated VHF antenna, the combination VHF/UHF antenna, a pretty expensive preamp that can combine the signals, and a distribution amp to run to the TVs directly as well as the Tivo. I don't think anyone would ever need 6 OTA tuners. However the BASE Roamio has the ability to be either a 4-tuner OTA or 4-tuner cable DVR, and thus is much more versatile, i.e. for lifetime service. If all else were equal (streaming, HDD, inputs/outputs, etc) I would DEFINITELY be more likely to buy lifetime service on a device that I could use whether I had cable or not, even if that meant giving up two [cable] tuners. But the responses in this thread have made it very apparent that most here view cable, OTA, and Tivo's value much differently than I do.