At one time, I was fit and well and did quite a bit at VLF. Apart from receiving several EU stations at VLF, I used
earth-mode and could detect my own signals at 6km. Further would have been possible.
Others, using
radiated signals, have covered some quite remarkable distances from amateur gardens with modest powers. At one time people said we'd be lucky to get "over the garden fence". How very wrong they were!
I still maintain the
Sub-9kHz Amateur Radio website. Quite a bit is happening and, contrary to popular belief, big antennas are
not needed for VLF RX. What is needed on TX are
very stable signals and very long times. Luckily, free software allows VLF MSK commercial stations to be used as stable signals to achieve lock.
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