Lualualei VLF transmitter

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VLF transmitter Lualualei, Mast 1
General information
Status Complete
Type Mast radiator insulated against ground
Location Lualualei, Hawaii, USA
Coordinates 21°25′13.38″N 158°09′14.35″W / 21.4203833°N 158.1539861°W / 21.4203833; -158.1539861
Completed 1972
Height 458.11 m (1,502.99 ft)
Design and construction
Main contractor US Navy
VLF transmitter Lualualei, Mast 2
General information
Status Complete
Type Mast radiator insulated against ground
Location Lualualei, Hawaii, USA
Coordinates 21°25′11.87″N 158°08′53.67″W / 21.4199639°N 158.1482417°W / 21.4199639; -158.1482417Coordinates: 21°25′11.87″N 158°08′53.67″W / 21.4199639°N 158.1482417°W / 21.4199639; -158.1482417
Completed 1972
Height 458.11 m (1,502.99 ft)
Design and construction
Main contractor US Navy
Lualualei VLF transmitter

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, were not only the tallest towers in the Western hemisphere at the time, 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.

Both masts are umbrella antennas. They are fed with the radio power to be radiated by an overhead wire, which is fixed at one end with the mast and at the other end to a small mast near the helix building. As this small mast is grounded, the feeder is attached to this mast with an insulator in the span field.

An image can be found at this link

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