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, Puerto Rico at 18°23'55"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, had originally 3 guyed towers. From these two were dismantled. Only the tallest with a height of 367.3 metres (1205 ft) is still standing and in use. It is the tallest structure in Puerto Rico and in the Caribbean region.

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Coordinates: 18°23′55″N 67°10′38″W / 18.39861°N 67.17722°W / 18.39861; -67.17722