This was the beacon TX I built for earth-mode tests at 8-9kHz. It can send either CW or QRSS at about 5W. It is some years since it has been used. A range of 6km was the best I achieved by utilities assisted earth-mode.
I don't think it has ever been used at this QTH and we moved here in 2013! My stroke rather stopped field work sadly. I would like to do more, but fear this will not be possible. I am sure much further would be achievable.
Interesting that earth-electrodes of sufficient size combined with plenty of power have been used in radiated sub-10kHz tests.
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