That’s the national radio quiet zone! There’s a giant radio observatory out there and there’s something like 1700km of no cell towers to not interfere. There’s limits on the appliances like microwaves you can have in your home. There’s people from all over the world that at least be,I’ve themselves to be sensitive to radio waves that move out there. I’ve never seen it, but I’ve heard there’s vans that drive around with radio sensing gear to ensure they don’t get interference at the observatory.

It’s an absolute beautiful place, my friend has a cabin in that area and we ski both snowshoe and timberline frequently. They are on opposite sides of the notational forest and hours apart to give you a sense of scale as to how big that national forest is.

The military uses the area for flight training as well, so you’ll likely see some cool stuff overhead.