Similar to what nappy posted
Top 3 most disturbing Broadcasts.
#2 UVB-76
This irritating electric noise is a Russian radio broadcast over a certain
frequency, constantly, non stop, 24-7 since alteast 1982.
The wierd part isnt the tone, its what happens when it stops...
in its 20-something year run, the sound has been interrupted only three times,
the earliest known time being Christmas Eve in 1997.
Each time a voice comes on and lists several Russian names
and numbers before returning to the foghorn.
It gets even wierder when you realize that the sound isnt a direct signal,
infact its broadcasted through a microphone,which means its actually a live
sound in a room.
Every so often, conversations can be heard in the background, though
they are difficult to decipher.