we had a young boy on a moped back in the day for one FM station, and he would hang around for about 30m at one box, then move on to another box, so the number would change half way thru the live broadcast. Great days, and great fun.

During the CB fad, another one night only FM station used only one box, but it was ringing red hot due to the publicity the local cbers gave it with their chatter..... word got around and spread like wildfire for this one off broadcast!!!