It is many years now since my health allowed me to carry out VLF earth-mode experiments. Results obtained with 5W and simple kit amazed me. I got a range of 6km and far further would have been possible. I kept a blog of my results which can be accessed via my website and old website at
https://sites.google.com/site/g3xbmqrp/Home/earthmode (do
not follow the links on the left of this
old website as these are very very old and may not work).
As I understand it, OFCOM is not interested in licencing earth-mode kit as long as no "harmful interference to wireless telegraphy" is caused. To be honest, I think conduction modes are a total puzzle to them! Without (free) software ranges would be much shorter.
See https://sites.google.com/site/g3xbmqrp3/vlf/8-97khz-earth-mode-transmitter .
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