I have never seen this video before. It appears he has recorded the radio broadcast with a camera mic which also happened to capture live concert sound from the distance. There was a 3 second delay between the real sound and the radio. I guess it's safe to assume he has not recorded the actual broadcast on to audio cassette, which could have been interesting to hear.
The taper has answered that the camera used was Sony Handycam DCR-VX 1000E Mini-DV Camcorder 3CCD 10x opt. Zoom
