no_step t1_iu69lmt wrote
Reply to comment by voucher420 in TIL that in 1968 the US Navy proposed turning 2/5ths of Wisconsin into a giant underground radio antenna so orders could still be sent to submarines following a nuclear attack on America by DeadForDecember
It was an ELF, extremely low frequency transmitter. Those radio waves need extremely large antennas and a particular type of soil
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