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| 8.97kHz earth-mode TX |
The conventional wisdom is that VLF requires huge antennas and enormous powers. This
not the case and radio amateurs have spanned thousands of kilometres with back garden antennas and modest powers. With utilities assisted earth mode (what I tried) just a few watts is enough to span very useful distances. For RX only, VLF antennas can be
very small indeed.
In the past I have copied
radiated signals from amateurs below 10kHz from several Western European countries.
Sadly my poor health has put a stop to my earth-mode experiments in recent years.
See
https://sites.google.com/site/g3xbmqrp3/vlf/8-97khz-earth-mode-transmitter
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