I borrowed these clock radios from the Banff Centre dormitories. They were tuned to a small pirate FM transmitter I constructed to broadcast 24 hour a day salsa music, in house.
I controlled the clock radios through a programmable X-10 system, which transmitted signals through the building's electical system that turn then off and on in sequence allowing the broadcast to 'magically' travel from one radio to the next as if the appliances were somehow 'haunted.'