When I set up my second Tivo (TivoHD) I ran setup, and told it No OTA. I then had a three day ordeal getting my cablecard authorized to work on it with Comcast (M-Card). I now want to save $8/mo and return the Comcast cable box, since they are planning on adding On Demand to the Premier. I want to move the TivoHD to the bedroom where the cable box is. Can I rerun guided setup on that unit to tell it I now want to add OTA without screwing up the cablecard settings?