65:, a 2,800-foot (850 m) peak above the east valley wall. The stairs were originally constructed as a means of reaching the radio antenna attachment points high on the surrounding ridge line. The trail starts at an elevation of 480 feet (150 m) and covers an approximate horizontal distance of 4,500 feet (1,400 m) for an average slope of about 30 degrees (however, some sections are nearly vertical). The Haʻikū Stairs are closed to the public, although people still illegally trespass to experience the nearly two-hour climb.
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system consisting of five massive cable antennas draped from atop one mountain ridge, and across the mountain valley to the top of the other ridge. The ridges formed a horseshoe shape around the valley. The natural height of the mountain ridges made for an excellent means of having an elevated
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antenna system. The construction and use of the facility was initially a classified military secret.
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The walls of the main building were over 5 feet (1.5 m) thick and made of
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131:"Ha'iku Valley, In the Past… - Ko'olaupoko Hawaiian Civic Club"
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is an amphitheater-shaped valley on the windward side of the
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The facility initially was built following the attack on
106:"A hiker's journey over Oahu's Koolau Mountain trails"
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radio transmitting station (later taken over by the
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161:The friends of Haʻikū Stairs website
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