How would J-20 communicate with drones while maintaining stealth?
Directed, tight beams with zero side lobes between A and B. In order to even successfully intercept the communication, the EW threat needs to be somewhere in the straight line between A and B.
Same with ship to satellite, ship to drone, drone to satellite, drone to drone, plane to drone, plane to ship, plane to satellite, land vehicle to plane, land vehicle to satellite.
These are why these flat panel phase arrays for digital communications are so important.