And we have a winner! Dan is correct: CHFA.
CKER is an interesting guess. They switched to FM (The World) from 1480 in 1994, but it is possible that the towers are still up. I have coordinates for them, so I'll check it out this summer.
The guess is also interesting because they also had a three towers in a row array, with the same pattern day and night, as I hinted for CHFA much earlier.
Back to our winning answer: CHFA. Run privately by a group of local citizens, CHFA signed on in 1949 as Alberta's only French language radio station. The station was sold to the CBC on April 1, 1974, though they had always been affiliated with the CBC, i.e. - paid to feed some CBC French programming.
CHFA installed larger towers in 1975 when they increased power to 10,000 watts. I cannot find any confirmation, but viewing the transmitter site pictured, I suspect they have been there since 1949. There is no CBC signage anywhere that I could see.
The transmitter site is in the Southwest corner of Edmonton, within the current City limits, just East of the North Saskatchewan River. The new Anthony Henday ring road freeway is at about the point where Zero Avenue would be, if it existed. CHFA is just South of the 36 Avenue South of Zero, on 170 Street, which would give it a 36xx 170 Avenue SW address. Here is a Google Map satellite picture of the site, with the towers clearly visible:
http://maps.google.ca/maps?f=q&source=s_q&hl=en&geocode=&sll=49.891235,-97.15369&sspn=41.976148,113.90625&ie=UTF8&ll=53.406145,-113.610606&spn=0.002357,0.006952&t=h&z=18&iwloc=addrNext week's Mystery Tower Quiz is in an Urban setting, as will be clearly apparent from the picture. What is less clear, at least to me, is whether it is actually still used for a television station transmitter site. I'm pretty sure that it is, but, having seen it from time to time over the last 42 years, I keep thinking it used to be taller. I haven't grown any taller since then, so it should be my perspective. Anyway, until 2005, the tower was also used to carry an FM station. Between 1947 and 1959, the site, and possibly the same tower, was used as an AM transmitter site. Today, a building on the same site is used as the studios for one TV station, two FMs and an AM. And they are not even co-owned!