> 100 degree cone free from any obstacles, 25 degrees up from the horizon

Yeah, but that's not really a tall order, particularly in the kinds of places where 4G/5G coverage is bad or nonexistent. Maybe not where you're deep in a gorge or under a tree canopy, but lots of the wilderness is open space, or at least has open space accessible.

And people in rural areas are already used to putting up towers to get crappy wifi over line of sight to the next neighbor/town. Dishy on a stick won’t be a major hurdle.