Please help. Simple, but still confused. Hearing different things from different sources. I have digital cable. If my tv does not have a tuner in it I must get the cable co. to change my digital box to an hd tuner. If my tv does have a tuner, will the existing cable line be ok. Does the tv convert it to hd. The existing cable line will be analog, because we're going to move the box to another tv for digital programs. Does it make a difference if the tv uses cable cars and we are only getting basic service. We only use the card if we have special programing correct? By not having the cable co do anything to convert can't we save the monthly hd fee?