Welcome to the forum, newmguy:
Thanks for the tvfool report and the detailed description of your setup. I think you are doing better than expected with WGRZ which is a weak 2Edge signal 104.5 miles away. The main problem is the curvature of the earth. The only way the signal can get to you is by refraction which bends the signal around the curvature of the earth, but atmospheric conditions will affect the refraction.
Using a coverage map from the tvfool interactive map browser, you can see you are beyond the fringe:
and here is the Longley-Rice coverage map. Red is a weak signal and no color at East Gwillimbury is even weaker:
This is the link for the Longley-Rice WGRZ map:
http://www.rabbitears.info/contour.p...=1070336&map=Y