I made a comment above about the mavic drones having 8km-15km+ "line of sight" range with their handheld WAP controllers, and my having flown 2km without any issues. I doubt i'll ever go to the max range, but the power is there to get in and around trees, towers, whatever.

But with 440mhz i've transmitted data over 100 miles with full decode, from my driveway in a forest with a 6 element yagi. And a couple of years ago the first trans-atlantic 440 (UHF) transmission ever was accomplished.

The main issue with consumer wifi is that it's attenuated by water, and by nature, nature is full of water. That's why UBNT switched to 12ghz or 24ghz for their long range "airfiber" stuff, and hacker hams try and find 902MHZ band capable equipment, as 900mhz can "punch through" more vegetation than 2.4 or 5.8ghz.