Here are the HDTV forecasts based on this analog reception:
> I am pulling in an amazing ABC (on 8)
That bodes well for getting a good digital signal on 8-1 (UHF 22), but, obviously, doesn't guarantee it, since that VHF signal on 8 has more oomph than the UHF on 22.
> a CBS, and an NBC (I think 29) all at amazing quality. As good as cable.
CBS is from the Massanutten translator on UHF 18, and that has no predictive value for digital signals, since there's nothing digital on that translator. Good analog, though. NBC-28 is from that same translator, rebroadcasting NBC-29. Same story there. But if you get NBC 29 well actually on channel 29, you'll have no trouble getting their digital signal on UHF 32 -- will map to 29-1 on your digial receiver.
>I am pulling in 2 FOXs one at 35 and one at 48 I think (I am at work now, so excuse the lack of proper channel numbers). Both FOXs are very fuzzy, though slightly watchable. The antenna is simply laying on my back porch right now, though I have tried holding it up higher on a ladder etc (I can see the Massanutten peak from the ladder). Whatever I do, I can't get the FOXs to come in clear.
FOX-35 is Richmond, and that's your nearest Fox digital possibility. If you can't get a fairly strong picture -- a little snow is OK but ghosts are not -- then you probably won't be able to get that Fox affiliate (on UHF 26).
> Are the ABC, CBS, and NBC going to be HD once I get my tuner?
CBS, no. ABC is iffy from Richmond but a sure thing from Harrisonburg when the antenna is pointed right at them. NBC is a sure thing from most places around Harrisonburg if your antenna is pointed right at them. So, you're likely going to have two problems to deal with: (1) Overall low gain numbers for the Terk (true in the lab, true in most locations -- but antennas are quirky enough that it can outperform others in a few places) and (2) Your ABC and NBC signals are about 90 degrees apart, meaning you can't simultaneously have the antenna pointed at both of them.
> Do you all think one of these Channel Masters I hear so much about, mounted in my attic, would allow me to add FOX to my OTA lineup???
Attic mounts are a roll of the dice. Inside my attic 8 miles southwest of Harrisonburg I can only get the local ABC and PBS affiliates with a ChannelMaster 4221, little brother of the 4228 that gets such favorable reviews. (That works fine for me since I have a huge external Yagi for the Charlottesville-Richmond axis.)
Have a look at www.plainmoney.com/antenna
for some links on how to find out more about what you'd get.