Actually, I think it was one of your previous posts that gave me the idea to try the Air2PCs. For $20/card, it was worth a shot to try them. Unfortunately, they didn't work out in my situation.
I just pointing out that HDTV reception can be significantly more finicky that OTA analog. Line of sight issues, tower signal strength, antenna height, buildings, trees, multipath interference, etc can mean that someone down the street can get a HDTV station that you can't. All you have to do is look in the HDTV reception boards to see that just because something works for one person doesn't mean it's going to work for another in the same city, much less in a different state.
The Air2PC r.02 cards may work fine and they may not, depending on each person's specific reception situation. Another thing to consider is # of cards you are planning on using. In my situation, when I had only 1 OTA card, reception was fine. When I split the signal to add 2 more, even with a quality preamp to preserve signal strength, reception quality suffered for the Air2PC cards, the Fusion was still OK.
I just didn't want to give the impression that buying a Fusion 5, compared to the old Air2PC is just a waste of money in every situation.
In my situation, the increased tuner sensitivity and the ability of it to handle multipath made the Fusion 5 a better choice for OTA reception. Add to that the Fusion's ability to do QAM and remove the whole antenna/reception issue from the equation altogether (an added bonus is that my cable provider leaves ESPN-HD clear in addition to the local HD channels), and it was an easy decision for me to go with the Fusion5s.
From my personal experience, it's only $20-30 for an old Air2PC. If all you are interested in is OTA, go ahead and get an Air2PC and give it a go. If it works in your situation, you've saved yourself some $$$. If you have reception problems, you might want to try one of the later cards with the newer tuner chips before getting frustrated and giving up on OTA HD altogether.
Personally, I would lean toward QAM, if it an option in your area. If there is a chance you would want to do QAM in the future, then I would lean toward buying used Fusion5s. The $40-50 saved per card by going with the Air2PC doesn't help if you end up replacing them to be able to receive QAM.
As far as OTA HDTV is concerned, I've found that is like the old saying.... Your mileage may vary.