I have both an ATI HDTV and a NVidia Dual Tuner - I've never had an issue with either one. If it's a reception issue, it's usually the antenna and not the card.
I did some research on this myself and almost a year ago I decided to go with DVICO. They offer a few options in HDTV tuners including USB HDTV tuners (which I own) and work pretty well.
Unlike the ATI which has only NTSC/ATSC tuners. The DVICO has a QAM tuner in addition to NTSC/ATSC which was EXTREMELY appealing to me. Now I dont need an antenna to receive local HD. AWESOME.
The downside is, is that its single coax but not a HUGE deal. Because DVICO's software supports multi tuners for PIP and dual recording. The only problems I have with DVICO's software is with Vista. I cannot, CANNOT, get timeslip to work properly with Vista. Its a great feature NOT to have but a small flaw to have HD. On XP I rarely had a problem with it.
I've used ATI tuners in the Past and I thought they were the biggest peice of crap.
DVICO is a bit more expensive than most but I think its well worth the money for stunning picture in HD that rarely skips a beat.
I bought a TwinHan 32500 (also known as the 3250) ATSC/NTSC tuner from 3btech for $40 shipped! It was identified by Vista right away and the timeslip seems to be working great! I doesn't have QAM, but it is cheap!
I would try one of the VideoMate series of TV tuners from ComproUSA. I've had a Compro TV tuner and an ATI TV tuner and IMO the picture from the Compro was much better. OTOH, the software from ATI was a bit slicker and advanced when compared to the Compro but I went for picture quality.
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