Canadians may have embraced the internet more so than those in the US but Americans are destroying us in terms of HDTV adoption (thanks to slow moving Canadian networks like CBC who might have a handful of HD capable cameras which they're too scared to even use).
Simply put, picking up a terrestrial broadcast via a quality antenna will ensure the absolute best picture quality. Sounds kind of backwards doesn't it? The resolution of HDTV (at 720P or 1080i) is so great that our cable providers must greatly compress the signal simply due to bandwidth reasons (mini dish providers do the same). Even though my Cogeco HD looks freaking amazing, it would look even better if I was able to pull those same channels in over an antenna.
The HD revolution is here, every major American city has about a dozen or so (at least) channels that can be picked up over the air. Here in Toronto people are left spending big bucks on equipment to pull in the Buffalo stations and the handful of Canadian stations. It's no surprise that such a proposal is being made. I'm kind of envious at the US television market, ours is downright pathetic.