I have a HDTV ready TV and am looking at subscribing to some HDTV programming. I'm looking for clarification on how this new HDTV tuner is going to work.

My local cable company has an HDTV tuner that I can rent for $15/month. With this, I get access to about 10 HDTV channels. What I am wondering is, once I get the HDTV tuner, will any of the other channels I currently have come in in HDTV? I often see shows that say they are being broadcast in HDTV, so I thought perhaps with the HDTV tuner, I would be able to view them in HDTV. Or maybe I can only get a true HDTV signal from one of these 10 channels that come with the rental of the HDTV tuner.

Any help would be appreciated. The cable company seems to be having trouble answering this question.

Thanks