The radars that detect anomalous returns are focused out of the U.S. The radars that are focused in rely on transponders aboard each individual aircraft to return a signal for the most part. One is for strategic reasons, one is for air traffic control.
Surely they’ve had military craft observing. Do these entities/phenomena have a radar signature, or not?
Surely they’ve had military craft observing. Do these entities/phenomena have a radar signature, or not?