Even though it's on 89.9 FM now, CHNS-FM is a descendant of 930 CHNS. And that station signed on the air on May 12, 1926, the first station in Nova Scotia. It migrated to FM in July 2006.
As you probably know, Canada and Mexico never set aside the FM dial below 92 MHz for non-commercial stations. So that's how a commercial Classic Hits station ended up at 89.9 FM. It calls itself 89.9 The Wave, Halifax's Greatest Hits.