> > The RSGB are still pursuing my 9kHz NOV application with the
> >  authorities

There is no requirement for any for of authorization below 9 kHz in Canada,
this is why the work I did last winter was at 8.998 kHz.

Same situation in Belgium : via our society (UBA) the question was raised
with the regulation authority (BIPT / IBPT) and their answer was that their
regulation starts at 9kHz, so below that frequency you do not need any
licence.
One should however take into account that all harmonics of a 8.9xxkHz
signal are well above 9kHz so only a clean sinusoidal signal should be used
especially if you do not use a tuned (narrowband) antenna.

Those who are interested in this matter should have a look here :

http://www.qsl.net/vk2zto/UEVLF/uevlf_comms.htm

the 'downunder' distance record seems to be 1.6km

73, Rik  ON7YD