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VLF transmitter Lualualei, Mast 1
Building
Type Mast radiator insulated against ground
Location Lualualei, Hawaii, USA
Coordinates 21°25′13″N 158°09′11″W / 21.42028°N 158.15306°W / 21.42028; -158.15306
Construction
Completed 1972
Height 458.11 m (1,502.99 ft)
Main contractor US Navy
VLF transmitter Lualualei, Mast 2
Building
Type Mast radiator insulated against ground
Location Lualualei, Hawaii, USA
Coordinates 21°25′13″N 158°08′57″W / 21.42028°N 158.14917°W / 21.42028; -158.14917Coordinates: 21°25′13″N 158°08′57″W / 21.42028°N 158.14917°W / 21.42028; -158.14917
Construction
Completed 1972
Height 458.11 m (1,502.99 ft)
Main contractor US Navy

VLF transmitter Lualualei is a facility of the United States Navy near Lualualei, Hawaii transmitting orders to submerged submarines in the very low frequency (VLF) range. VLF transmitter Lualualei, which operates under the callsign NPM on 21.4 kHz and 23.4 kHz, uses as antenna two guyed masts, each 458.11 metres (1503 feet) tall. Both masts, which were built in 1972, are not only the tallest towers in the Western hemisphere used for military purposes, they are also the tallest towers used for long wave transmissions in the Western hemisphere and since the collapse of Warsaw Radio Mast perhaps the tallest structures electrically insulated against ground.

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