12,000 (square) mile wifi!

22 Mbps to how many people?

Exactly what I wondered about, since most of the spectrum is already used and bought by companies.

And 22 Mbps isn't that much, especially when you're thinking about the amount of bursts and collisions on that range (300 microsecond delay from just the speed of light.). If you have more than, say, 10 people on that network, you'll not have that much broadband for each of them.