It may be picking up a radio station that has a strong signal. It sounds strange but it has happened with my desktop speakers from time to time.
I have a Huge Antenna 4 gardens down from mine,this man is an Amature Radio Enthusiast(am-Band) its only talking i get and its very difficult to make out but its there.
Thanks Neo7 we are a world apart and you have experienced the same issue,thats what i call amazing.
[Edited by Mirraluka, 4/9/2012 5:14:07 AM]