I had the Digiwave CM4221 clone and was able to get all the US stations but not the Canadian except for CBC so switched to the same antenna you have. One antenna is pointed in the same direction as my previous CM4221 clone and the other at an angle to hit the CN Tower. It brings in some of the Canadian channels but not in high def and I assume they not digital as the image is pretty poor with a lot of snow.

I think this is more of a reflection of the Canadian signals being weak than the antenna being of poor design.