Brb, my sauna is finally at 100°C.

I had to essentially read the same thing four times before there was any new information in this post. Not sure if that’s a Jerboa thing or what, but probably could have been avoided.

Look into fixed wireless or 4G/5G home internet. Fixed wireless is sometimes exactly what you need in spots like that. It is not 4G or 5G, sometimes it is just long range WiFi or other lax spectrum.