If you could use a small receiver, it could be mounted on an aircraft. The transmitters would have to know the velocity vector of the aircraft so as to adjust t

If you could use a small receiver, it could be mounted on an aircraft. The transmitters would have to know the velocity vector of the aircraft so as to adjust their focus to where its receiver will be when the waves get back to it, not where it was when its pilot wave was sent. Without some (quantum) way to ensure that the energy is delivered exclusively to the rectenna, such a system would be hard to justify deploying.