Earth-mode is a form of VLF communication that is open to all. With 5W I managed to cover 6km, although far further should be possible even with the same gear. I have updated my webpage to include a link to my earth-mode blog showing my experiments some years ago.
My understanding is this does not require a UK licence, but check with OFCOM as I cannot give legal advice.
See https://sites.google.com/view/g3xbm4/home/vlf/vlf-earth-mode .
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