Years ago one of my favourite activities was experimenting with VLF earth-mode communications through the ground.
I would put a beacon on at home and go out to see where it could be copied. Ranges surprised me and far further would be possible. Sadly, I can no longer do these experiments, but this is a rich seam ripe for others to carry on. Certainly higher power and bigger baselines would help. At some point signals that are radiated would be detectable at great range. Very stable (GPS locked?) signals would allow very long integration times.
My blog is still there on my original website. Hopefully, this will give you some ideas. This old website is not maintained, so please do not follow the links on the left as they may not work!
See https://sites.google.com/site/g3xbmqrp/Home/earthmode
8 May 2020
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