Making a giant coil to transmit signal at 9khz

Hello friend this  gentlemen (W1VLF) wanted to make a radio communication at the farthest distance possible at just below 9kHz. and he was able to make it possible.
But what attracted us is a giant coil which was made by him at his backyard with so much hard work. He has to make such a giant coil to achieve high inductance so he could produce resonance at about 9kHz.

To have a look at whole making process and test results have a look at his website.

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