With an
unamplified RCA ANT121 Rabbit Ear/Loop antenna (got it half price, may have been an instore sale) in concert with
ANT1450 low-noise signal amplifier (both from
Princess Auto, I was able to easily get CBC, CityTV, and OMNI (UHF).
With all the rebar in my centennial era apartment, I've been able to get Global (VHF 13), but only in one particular spot in the whole room, just below and slightly away from the window, and only with one particular angle of the rabbit ears (away from the tower, I must be getting a bounced signal), and only, oddly enough with the rabbit ears completley collapsed. So far, no luck getting CTV (VHF12), which is odd considering its on the same tower as Global.
While leaving the antenna in the same position, after unhooking the amplifier I only get CityTV (UHF), while CBC, Omni (both UHF) and Global (VHF) all are lost. So in this case the amplifier is definitely a help, not a hindrance.