Might be great for passive radar.

On Fri, Oct 15, 2021, 6:58 AM grarpamp <grarpamp@gmail.com> wrote:
Did someone's wallet just get lighter :)

It's rx-only though... cpunks still need a way to communicate
freely worldwide without using GovCorp infrastructure, passing
beyond borders of jurisdictions and continents... via encrypted RF.
Using both shorter HF P2P hops, but also reaching out as far
as possible using whatever antenna you can manage to raise
or lay down...

https://en.wikipedia.org/wiki/Extremely_low_frequency
https://en.wikipedia.org/wiki/Spark-gap_transmitter

Jim may volunteer for the new quantum radio division...
https://duckduckgo.com/?q="quantum+radio"