For a long time in the late 1960s, when I DX'ed actively from Burnaby, CHFA was the only remaining Alberta station, other than LPRTs, that I had not heard.
I only ever heard them once, on a Monday morning at signon, before KNBR and daytimers such as KOMW (Omak, WA) signed on. And, of course, before CBU-690 signed on. Where was CJOB-680 Winnipeg? Probably on the air, but on night pattern, which sends their signal NNE and nowhere else.
In those days, CHFA had 5000 watts. Hard to say what their directional pattern looked like, as they really had to tighten it up to get 10,000 watts granted, as the CBC did as soon as they bought them.
Overall, between CBU on 690 and KNBR on 680, 680 was a really tough frequency to DX. KOMW was the second to last Washington station I heard, with only KPOR-1370 in Quincy to go before I managed to hear every AM station in Washington state. Both of them were 1000 watt non-directional daytimers back then.