Take also a look on this very informative website https://sites.google.com/site/sub9khz/home
about "Sub 9 KHz amateur radio" !!!
You have to visit the website of DK7FC to http://www.qrz.com/db/DK7FC
and also the site of DJ8WX, http://dj8wx-dl.de .
A real pioneer who inspired me to listen in the "Sub 9 KHz" band.
If I discover new facts, I will publish it at the "Experiences
73's, Peter - de PA1SDB