Experiments continue at very low frequencies by radio amateurs. This is an area where all can take part on RX as the antennas can be very small indeed, yet highly effective. This is one of the frontiers in our hobby.
It is honest that to radiate a sub-10kHz signal does need a big antenna and dedication. Nonetheless, we need far more monitoring stations on RX only.
In the past I have tried to keep abreast of happenings at extreme VLF with my website on sub-9kHz operation. If I fail to update quickly, there are links to very up-to-date information. In 2021, I shall do my best.
See https://sites.google.com/site/sub9khz/news21 .
See also https://sites.google.com/site/sub9khz/home .
See also https://sites.google.com/site/g3xbmqrp3/vlf .
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