Sugarloaf Mountain and Urca Hill Natural Monument Mountain, then an island, on 1 March 1565. The site was chosen to guard the entrance to Guanabara Bay, and the mountain was important as a signalling point. A landfill connected the island to the mainland in 1697, and various buildings were erected to defend the territory, but the Urca urban neighborhood was only built 300 years after the city was founded. The Sugarloaf Mountain and Urca Hill Natural Monument was created by the city of Rio de Janeiro by municipal decree 26578 of 1 June 2006. The objectives are to guarantee green spaces for leisure in a natural area,
Sugarloaf (Christchurch) 10 km away from Sugarloaf Mountain, but it is unclear if this option has ever been given technical consideration. Likewise, the Christchurch suburbs of Redcliffs and Sumner have limited coverage from Sugarloaf, with radio (and formerly analogue television) provided through a low-power repeater in the suburb of Southshore. The following table contains television and radio frequencies currently operating at Sugarloaf: The following frequencies were used until 28 April 2013, when Sugarloaf switched off analogue broadcasts. An RF emissions report conducted on 9 February 1998 by the National Radiation Laboratory found that maximum exposure levels of 8 μW/cm2 were detected in