I know that you know that the American stations that are in the gray and are very weak signal strength are not all UHF stations. Like KCPQ-DT 13 Fox and KSTC-DT 11 The CW and others. You can use the all channel antenna you have to go after the very weak American stations or you can install a Winegard HD7698P antyenna ,
http://www.canadapost.ca/shopper/ite...7698P?local=en . There are TV DX web sites on the internet , and you can entertain us with how you received KSTP-DT 11 FOX for 3 hours with no dropouts and signal strength meter was at 90% and signal quality meter was at 80%.