I don't understand what you mean. If CBS sells Tide a spot during David Letterman, that spot gets seen by CBS affiliates OTA as well as that same station on cable and satelite. Satelite still don't have the bandwidth to carry all local programming. It seems to me if you turn off OTA it would limit further the number of people capable of seeing the commercial. Also, it would seem to me less likely OTA commercials would be skipped by people using Tivo or DVR devices. OTA is a bit more involved to record, or at least not as convenient.