And, here is a link explaining what they are: https://en.wikipedia.org/wiki/Whistler_(radio)
One problem is that, to hear the signals in the range of 0 Hz to 20 KHz, it is best to get well away from the urban environment with all the 60 Hz power line noise. So, I thought one could place the receiver on a mountain top. It could be powered with solar cells and beam the data back on a telemetry link (UHF) to a receiver here in the valley. From there, the data could be made available as a feed to the MESH network sites.
More later....
