Aguada transmission station

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Aguada transmission station is a facility of the US Navy for transmitting orders to submerged submarines near Aguada in Puerto Rico at 18°23'52"N 67°10'38"W by using radio waves in the low frequency range. Aguada transmission station, which works on 40.75 kHz with the callsign NAU, has 3 guyed towers, the tallest is approximately 1000 ft ( 304.8 metres) tall. (exact value required)

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Coordinates: 18°23′52″N, 67°10′38″W