Comcast HDTV???

The Box your getting is the probably the Motorola 5100. Its has component, S and composite video as well as Toslink, Coaxial and analog rca audio. Component cables are needed for high def TV and I would recommend going toslink , as I have , for the audio. I have read other forums where some people had problems going coaxial for audio. As far as the high def picture, last night I watched the superbowl and the Hi def picture was awsome.

Some people have said they have had audio drop outs with coax, although you may not. Since you have to move a large piece of furniture , I just thought I would give you a heads up. I have it connected with a Wireworld glass toslink and the sound is incredible. Even many non HDTV programs are presented in Dolby Digital. I use a Cardas Digital lightning coax for music.

As far as buying a cheap Radio Shack antenna, you would have to buy an HDTV {not cheap} tuner 1st.

As far as Comcast not being able to answer questions, thats because the people you speak to on the phone are just {no disrespect} clock punchers. Most do not know the difference between HDTV and HGTV. Their is a wealth of information on www.AVSForum.com

Glad your up and running !! HBO and Showtime are hit and miss. Alot of their stuff just seems to be upconverted, but keep flipping. Without warning a movie will come on and Wow ! you will be blown away. . The PBS demo channel with alot of features on cities around the world is amazing, better than DVD IMO. The Superbowl was also amazing, because like the PBS demo loop, they are shot with true HDTV camera's. As time goes on, more material will be originally created using HDTV camera's . Hi def is now a reality folks, as the primetime lineup of HDTV is growing, most major sporting events are now lined up for HDTV, and ESPN will be in full HD by April. Enjoy !