Hi, I just called my cable company (Comcast) to find out about HD cable. I already have the Zenith HDV420 and an antenna for local reception. I wanted to find out when they are going to be broadcasting HD cable. It was a big pain in the ass mess. Anyway the rep told me that HBO and Showtime are showing movies in HD. She said I could get them through my cable box, which is only S-Video and my TV does not have a built in tuner, she was set on the fact it would work, I know it wont. I need to hook up my cable to the STB to get the HD picture if there is even one. I don't think there will be. Do I run the risk of damaging anything by doing this? She told me what channels they are 550 and 575 but the STB does not go that high, so I would need to do a CADTV scan, would I just run the main line into the box? When I watch those channels nothing says broadcast in HD. If anyone else has had experience with this please help me out, thank you.