There’s a lot of history if you dig in, I had stumbled upon the one in MI, looked it up to find out what it was, “was” is interesting, “is” not so much, the world has gone to pot, its now owned by a marijuana grow
At 2watts the IR loss would be very high and the effective radiated output would be decreased by the ir drop of the wire. The wave length of an ELF signal would be C/F: where C= speed of light, and F= radiated frequency.
ELF freq of 1.5 Hz would have a wave length of 186,000/1.5 or 124,000ft, or 23.5 miles. So a halfwave antenna would be 12.75 miles long. An ELF of 0.5 hz would be 279,000 ft, or about 53 miles long with a halfwave antenna of about 26.5 miles.