HAARP Gakona :

 

a recording from Patrick Robic (2008)

they verified with a nice QSL card (Coastas Krallis, 1999)
another fine QSL card (Patrick Robic, 2008)

see their website for more details on this project

 

------------------------------------------------------------

Frequencies Data
4990
6792.5
6990
...and many others, used for testing