Norwegians will tell you differently.

I just looked over your link, and Radio Tromsø, the hit station, is the one I heard online. It's one of the regional FM remaining stations. There are some in the Oslo area as well, and the other big cities. The DAB system had only so many slots, and they were sort of raffled off to the commercial stations with the biggest ratings.
If conditions are just right, you might be able to hear some FM from northern Sweden and Finland, including a couple Sami FM stations, although the nearby mountains might preclude that. Should be interesting to listen either way.
I know the NRK has a Folkemusikk channel and a Sami channel. I believe they're both on DAB. I have heard them online before. Both channels are pretty good listening.