Can you receive hdtv signals on dig. cable?

Only if your cable system is transmitting HD signals. Only a few are, and I'm not sure what hardware you need. But the digital cable product most of us can get IS NOT HD, and requires a digital converter box even if you have a DTV. Picture quality not any better than analog on the ATT system in my area.

Yes; but you would have to buy a second round dish and point it at the HD "bird". The oval dishes are only 149 at C City and less on line, The OTA antenna-- along with a STB is the way to go. ( If you live in a large enough city) In LA here, all stations are in HD. Once you have a roof top antenna and the receiver(stb) the OTA programing is free. Cable will be doing HD soon, I've heard.

Thanks guys. Two more ?'s. What is STB? And while i'm at it, what the hell does YMMV mean?

Your Mileage May Vary!

KP

Though this comment is not specific to your post, I thought I'd chime in with a response to Swampwalker's remark about digital cable. I subscribe to AT&T digital cable in the Seattle, WA, area, and my experience is the same as Swampwalker's: digital cable video quality is no better than analog, and in this area has been further aggravated by frequent service problems. The extra expense for the digital subscription has yielded nothing, and I am seriously considering reverting to analog service until I am forced to choose something else. The television and cable broadcast industries have, in my opinion, done a miserable job in offering better picture quality (let alone content), which leaves me very dubious about HDTV as a viable offering in the next 5+ years (even if there is a federal requirement for adoption of the HDTV standard).