I know that it's transmitted as un-adulterated 8VSB. I'm not sure, however, how they modulate to such a high channel number.
The last time I had cable was long before HD was transmitted commercially, and I swore I'd fill the next cable guys's arse with rock salt that came on my property again. If I have to, however, I may have to modify that stance if it's the only way to record movies.
Unfortunately, this situation is not likely to last very long. The recent pressuring of Dish Depot not to sell 8VSB modulators makes me think that QAM is coming quick to cable delivery.
ABC = Another Boring Channel. Watch CBS on Monday Nights!