Matches in DBpedia 2015-10 for { ?s ?p "The Warsaw Radio Mast was the world's tallest structure until its collapse on 8 August 1991. It is the second tallest structure ever built, being surpassed as tallest by the Burj Khalifa, completed in 2010.The mast, which was designed by Jan Polak, was 646.38 metres (2,120.7 ft) tall. Its construction, started in July 1970, was completed on 18 May 1974, and its transmitter entered regular service on 22 July of that year. It was located in Konstantynów, Gąbin, Poland, and was used by Warsaw Radio-Television (Centrum Radiowo-Telewizyjne) for longwave radio broadcasting on a frequency of AM-LW (long wave) 227 kHz before 1 February 1988 and AM-LW (long wave) 225 kHz afterwards. Its base was 115.2 metres (378 ft) above sea level. Because a voltage potential of 120 kV existed between the mast and ground, it stood on a 2 metres (6.6 feet)-high insulator. It operated as a mast radiator (half wave radiator), so its height was chosen in order to function as a half-wavelength antenna at its broadcasting frequency. The signals from its 2 megawatt transmitters could be received across essentially the entire globe. Its weight was debated: Polish sources claimed 420 tonnes (930,000 lb)."@en }
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- Warsaw_radio_mast abstract "The Warsaw Radio Mast was the world's tallest structure until its collapse on 8 August 1991. It is the second tallest structure ever built, being surpassed as tallest by the Burj Khalifa, completed in 2010.The mast, which was designed by Jan Polak, was 646.38 metres (2,120.7 ft) tall. Its construction, started in July 1970, was completed on 18 May 1974, and its transmitter entered regular service on 22 July of that year. It was located in Konstantynów, Gąbin, Poland, and was used by Warsaw Radio-Television (Centrum Radiowo-Telewizyjne) for longwave radio broadcasting on a frequency of AM-LW (long wave) 227 kHz before 1 February 1988 and AM-LW (long wave) 225 kHz afterwards. Its base was 115.2 metres (378 ft) above sea level. Because a voltage potential of 120 kV existed between the mast and ground, it stood on a 2 metres (6.6 feet)-high insulator. It operated as a mast radiator (half wave radiator), so its height was chosen in order to function as a half-wavelength antenna at its broadcasting frequency. The signals from its 2 megawatt transmitters could be received across essentially the entire globe. Its weight was debated: Polish sources claimed 420 tonnes (930,000 lb).".