I have an ATI ViVo card, not an AIW. (That's the RADEON 64 DDR VIVO, for those of you scoring at home)
It has video in/out but not a tuner.
Unless it says it has a tuner, it doesn't have one.
But for most purposes, Video-In is sufficient. I have a stereo VCR that, and I just run the composite out into the video-in, and the stereo to the line-in and it works fine.
If you have to have a tuner, you can also buy a separate tuner card (companies like hauppage now make HDTV tuner cards).
But ATI's video stuff is really well done.
(note that in my experience video recording through ViVO with a SB Audigy card doesn't work -- no audio).