That is the exact direction things are going in, except rather than beaming towards cell towers, they transmit/receive to satellites, to get the bandwidth needed... and the connectivity over the oceans and sparse land without cell towers.
It would not be too difficult to use quad copters to provide connectivity across very large areas.
You could tether the vehicles to a simple ground station using a length of small, strong, twisted pair wire.
If you send high voltage AC up the wire there will be minimal loss and you can convert to lower voltage DC to run the quad copter’s motors and electronics.
Data could be sent up/down the twisted pair wire as well.
A height of say 500 or 1000 feet and you would get really good coverage....and communications between vehicles at altitude would be very long-range.
Extreme weather might be a problem from time to time but it’s still an interesting idea.