I used an AM radio Mr. Microphone one time to "just play a little". I took the telescopic antenna off, connected very lengthy wire to the terminal, strung it all over my bedroom, used a 9 volt battery in place of the two AA that it normally accepted, and stuck the microphone inside a headset. The music piped into the mic radiated strongly all over the house and out into all sides of the yard for about 25 feet. Then, I walked down my mom's 1000 foot driveway, got 2/3's of the ways down, and found a spot where the signal somehow skipped to. My station came back in.
Then, I got greedy. I connected five 9-volt battereis in series and had 45 volts passing through the Mr. Microphone. I also took the mic outside and strung the wire around the branches of a tree. The mic started spewing smoke; it fried the transmitter.
No major loss though. I bought the mic at a liquidation sale when Hills went out of business in Cincinnati in 1991.
Pretty cool!