try relocating the antenna or aiming in other directions. give us more details of your setup. I get it plus all canadian chs fine in mississauga with a cheap (20 USD) but very good IMO small powered outdoor Monoprice.com antenna. CTV and CBC are the highest powerd canadian digita lstations in the GTA. Well the OMNIS comes in strong as well. UHF signals propagation is affected by weather and atmospheric conditions so is normal to see them vary in strength even in 24 cycles while the TX power stays the same.