Sub 10kHz amateur DX in 2011

Back in 2011 I was very involved in amateur VLF below 10kHz.  

To be successful bandwidths of tiny fractions of a Hz are needed and integration periods of hours or even days.  As would be expected stability has to be perfect with many locking their signals to GPS or similar. 

Remember, amateurs have limited power and space for antennas!

DJ8WX was a regular signal back in 2011.