Fox out of Philly puts forth a half-assed attempt at digital, anyway. No HD, just "fox widescreen" which is essentially 480p widescreen.
I have noticed out-of-sync audio, but only on the commercials, oddly enough. What I find most annoying about Fox (aside from the fact that they frequently forget to "flip the switch" and offer little quality programming in 480p widescreen) are frequent audio pops and transmission errors. I get those annoying green dots and pixelation quite frequently.
I have a channel master antenna w/preamp connected to a Dish 6000 8vsb module. I actually get Fox at a higher signal strenth up here in the Lehigh Valley than I do either CBS or ABC, but the signal itself seems to be entirely unreliable.
Besides, I don't watch Fox that much anymore anyway. If it weren't for UPN, Fox would be at the bottom of the barrel.