The rules around the Citizens Broadband Radio Service spectrum were changed in 2015 to make it easier for wireless ISPs to license space, but might be changed right before they are useful.

https://motherboard.vice.com/en_us/article/ev5mm7/at-the-behest-of-t-mobile-the-fcc-is-undoing-rules-that-make-it-easier-for-small-isps-to-compete-with-big-telecom