To add to VelvetR's post. . . In remote Native villages you may be dozens, even more than a hundred miles from the nearest community, with all of just a few hundred residents populating the village. To reach a community like that a station would need to spend enormous amounts of money for very little in return.
For example, I live in a North Slope village about 250 miles north of Fairbanks and 250 miles south of Barrow. There are only about 350 people living here, in a community spanning just a few miles at most from one end to the other. No roads in or out, so the nearest village could take the better part of a day to travel to by snowmachine across the Tundra or through the mountains. We have two translators here: one for KBRW from Barrow, which plays a mix of NPR, several different music formats, Inupiat language programming, public announcements from all North Slope villages, weather updates from across the Arctic, and religious services weekday mornings and Sundays. The second station, with a religious format, broadcasting I think out of Bethel, has relatively few listeners that I'm aware of. KBRW seems to be what everyone listens to, even when internet radio is the best listening option.
It just wouldn't make financial sense for a commercial station of any format to broadcast to most Alaskan villages off the road system (with the exception of the larger hub communities like Nome, Bethel, Kotz, etc, and Southeast).