@AE4WX @flockofnazguls @th Oh, no doubt. Clearly the person worked in broadcast in their local area or was a sufficiently obsessed amateur. But you can't just "round up the usual suspects", and IIRC it was generally believed the hijack was done from a van, so getting caught in the act on such a short transmission doesn't seem likely.
I've heard of pirate radio stations running out of a van that went years without getting caught.