This is interesting, I could hear controller and pilot talking. But they had some sort of stereo-separation! Pilot was to the left and tower to the right. Thats not possible, is it? I assume the audio is mono in real life.
For the recording, with the ground transmitter stationary, it could be separated by one receiver shilded to look at only the ground transmitter, and a second omni-directional one for anything flying.