DK7FC ground dipole experiments on VLF

Stefan DK7FC did a succesful transmit experiment utilising a ground diole on VLF. This resulted in a really strong signal on our Warsaw grabber (over 900km distance):

The spectrum after amplitude normalizastion:

The antenna had about 900m and the current was about 1A. A full descrption is avaliable in the  rsgb-lf-group list archives: