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AT&T has released a new digital cable system called U-verse. With U-verse, viewers can get a goodly number of high definition channels. These channels come from DirecTV. DirecTV, as you know, is one of the satellite providers that offers Setanta. it seems if U-verse pipes in DirecTV HD content to their subscribers, they could also pipe in content such as Setanta, if the demand was there.
Swing by the U-verse site and let them know about Setanta. U-verse's service areas are growing and its lower prices (generally) compared to Comcast would make it a good choice as far as cable systems go. I recently went to it myself and have been pleased.