Living 70 miles east southeast of Toronto, Channel 9 CFTO doesn't have much of a signal here, but I could sometimes get it thru my attic bowtie antenna, by aiming it the wrong way. I discovered the other day that if I turn on my three way light (the new efficient kind) while watching CFTO, the channel 9 is GONE! The antenna is about 10 feet above the light in my living room. It doesn't seem to interfere with any other frequency.
Reception on many Toronto UHF stations was poorly (unusually so) this past summer, but seems now to have returned to normal.