What was likely the northernmost broadcast station in the world has shut down its transmitter.
CHAR, 105.9 FM in Alert, Nunavut, Canada has asked the Canadian government to cancel their license, and the government has done so. The official in charge told the government the station has been off the air since February 2006. A web search suggests CHAR has become a cable-only operation. The authorized location of their tower was at 82-27-12N.
I believe the northernmost radio station is now either Qaanaq Radiunga (93.5 FM) or KNR (95.0 FM) (link is in Greenlandic) at Qaanaq, Greenland. Qaanaq lies at 76-31-50N, well north of Canada's northernmost surviving station, CBIL 105.1 at Resolute, Nunavut.
(About KNR, in English)