Wardenclyffe Tower

Also known as the Tesla Tower, Wardenclyffe was an early experimental wireless transmission station designed and built by Nikola Tesla in Shoreham, New York in 1901–1902. Tesla intended to transmit messages, telephony and even facsimile images across the Atlantic to England and to ships at sea based on his theories of using the Earth to conduct the signals. He experimented with VLF signals too.

(Source: Wikipedia, via Bob Houlston, Norman G8ATO)

Tesla at Wardenclyffe:

https://teslasciencecenter.org

https://www.aps.org/programs/outreach/history/historicsites/wardenclyffe.cfm

https://www.teslasociety.com/warden.htm