I'd tend to say it may be noise generated from a computer or other nearby
electronic gear.
If he can still hear it then he should be able to start shutting down
electronic devices one at a time and see if it goes away.

"Charles C." wrote in message
...
A friend of mine heard this on his FM radio at about 88Mhz. It sounds like
a noisy electrical circuit to me, but I am no expert. Just wondering if
anyone could confirm this? Forgive the dumb question. Thanks!

http://traladin123.fastmail.fm/sound.mp3