Pocket-sized VLF antenna keeps comms open where conventional radios fail

Needless to say, this makes the setup not exactly portable, but it fulfills a very important function. Conventional radio transmitters work very well over short distances, but not over long ones, and they are easily blocked by rock or water. However, VLF radio waves are reflected by the Earth’s ionosphere and can travel through the Earth and even into the deep ocean.

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