Here’s a compilation of links to various Finnish radio stations which can be streamed over the Internet:
The links to the streams are available in a couple of different formats. You’re advised to install the VLC player which will handle the .m3u playlists. Alternatively, you could try the links in the second (Selaimella toimivat linkit) and third (Stream osoitteet) tab on the site.
The logos on the darker background are stations which do not provide 24/7 programming. You can also find a couple of dozen regional YLE radio stations hidden in the drop-down menu (Maakuntaradiot).
I have no idea how many of these are geographically restricted.