These mysterious stations transmit in many different languages, using male and female voices repeating numbers or code words 24 hours a day.
Little information is known about the origins of these messages.
The Irdial Label released a 4CD set that contains over 150 recordings that span the last 20 years; taken from the private archives of dedicated shortwave radio listeners from around the world. The label has made these recording available for download.
Download the complete Conet Project CD1 & CD2 - here
Download CD3 & CD4 - here
Stream the Conet Project - here
National Public Radio program 'All Things Considered' - link