Your main challenge will probably be measuring the distance between neighboring drones as accurately as possible. AIUI you could recover signal from unevenly spaced receptors IFF you know precisely where each receptor is.
After that it's just a standard computational problem which is (IMO) far less interesting.
Well, I was thinking that for GHz level signals, you can't just beam your stuff down to a ground station due to bandwidth limitations, so your drones can't be just dumb ADCs, and there would need to be some compute on board. Time synchronization also becomes interesting.
After that it's just a standard computational problem which is (IMO) far less interesting.