Compression is standard in the industry, so not true. Even the commercials are compressed but came across in HD in all cases (at least early on). What I saw was likely dropped packets forcing packet re-sends and eventual drop back into SD (480). I solved the issue of randomly switching between HD/SD by selecting Medium resolution (SD) mode on the PC (Chrome Web browser). But on a 65" TV, not pleasant. It seems the folks on Apple TV had the best experience so that makes me question the root cause. Was it the broadcast or the PC Web Browser/Media functionality? Or maybe a combination? Does Apple TV have a larger buffer such that the lost packets can be resent before they are needed?