We need some more info on your setup. It sounds like you have a splitter somewhere. How is your cable connected?
It sounds like you've got coax coming into the TiVo, then out from the TiVo to Ant A on your TV. And maybe you've got the composite outputs of the TiVo connected to Input 2 of the TV as well?
But then you mention HD channels on input 2, so those can't be coming through the TiVo. Do you have a cable box in the mix somewhere?
More details on the actual setup will help.
It sounds like you've got coax coming into the TiVo, then out from the TiVo to Ant A on your TV. And maybe you've got the composite outputs of the TiVo connected to Input 2 of the TV as well?
But then you mention HD channels on input 2, so those can't be coming through the TiVo. Do you have a cable box in the mix somewhere?
More details on the actual setup will help.