g3kev wrote:

LF techniques covering every aspect have been documented over the years
and while some purport to be inventing new methods they are really
copying what has gone before. The broadcast industry has covered it in
great depth and the various Government Agencies have also perfected the
two way communications aspect especially narrow band methods. It seems
the majority interested in LF do not realise this and think they are a

first.

Really?  One of my interests in amateur radio is to have a bit of FUN
using radio, including the LF bands.  There are no firsts in the having
of individual fun.

Bob ZL2CA