I've got two setups to report on. My setup, indoor Sharpshooter (specs in signature), pulls in CHAN-DT at 65-70% without moving the antenna ('tho I don't see why I'd need to since Global and CBC are at the same location). I also notice that the audio is 5.1DD. I don't know if it's true DD. I am getting quick audio skipping/dropouts occationally, but as luck would have it, just as I type this out, it's been fine.
Upstairs on my old man's Bravia w/outdoor SquareShooter, it's able to pull CHAN-DT in at 98%. Just as strong as he gets CBC. CTV however is 95%.
Now, they just have to report on Global's news that Global's in HD over-the-air, so that everyone watching hears the news.