I would recomend going to The Source and buying the Nexxtech model#1501880 for $59.99. I live in Toronto and am using it with great success. Check out this site [Link: hdtvexpert.com]
where they actually test the Radio Shack (The Source) 15 1880 against the Silver Sensor. They even have to hook the unamplified Silver Sensor up to a Channel Master preamp to make the test more fair. I don't think any stores in Canada even carry the Silver Sensor anyway.
Another good indoor antenna is the Terk TV5 which I got off of Ebay real cheap. The reviews for it on www.circuitciy.com
are amazing so I wanted to try it out. I compared it up against the 15 1880 and it was a close 2nd. Unfortunately I don't think it is sold in Canada either. Bottom line is you can't go wrong with the 15 1880.