I’ve been shopping for a mini-FM transmitter to send a signal from my PDA to my car’s radio and I found this curiosity. :-)
Like all mini-FM transmitters in the US, it has been range-limited to about 30 feet. But this one has a variable resistor on the inside… With the turn of a screw you can go from a legal (and wimpy) 30 foot range to a respectable 175 feet.
Find it at Amazon