Some radio transmitters are built to great heights in order to reach audiences far and wide. In fact, nine out of ten structures taller than 500 meters are radio transmitters. The Warsaw Radio Mast in Konstantynów, Poland, was the tallest among them, standing at an impressive 646.38 meters. This would have made it the third-tallest structure globally, following the Burj Khalifa tower in the United Arab Emirates and the Merdeka 118 tower in Malaysia, had it not collapsed in 1991.
The Warsaw radio mast was completed in 1974 and was built to replace the radio transmitter at Raszyn, which had previously served as Poland's central longwave broadcasting station. However, the Raszyn transmitter, standing at a modest 335 meters, fell short in providing nationwide coverage, despite attempts to boost its transmitting power. In the late 1960s, the decision was made to build a new central transmitter at the geographical heart of Poland. Konstantynów was selected not only for its central location but also for its high soil conductivity, which facilitated the efficient propagation of low-frequency radio waves.
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Source: amusingplanet.com