Avala Tower is one of 262 broadcasting stations owned by the Public Enterprise Transmitters and communications from Belgrade (Republic of Serbia). It was built on the hill Avala, 11 km southeast of Belgrade, but not on its top, whose height is 511 m, but slightly lower, at an altitude of 439 m. The Tower on Avala is a masterpiece of world architecture and the most beautiful symbol of the capital of Serbia. He was devised by the cleverest people of Serbian architecture, and for many reasons it was unique in the world and by its architecture it is among the most beautiful towers on the planet. His construction, based on the project of architects Uglješa Bogunović and Slobodan Janjić, started in 1961 and was completed in 1964; For visitors it was opened a year later. It was the only tower in the world whose tree is in the form of a flat triangle, with reinforced corners of the circular cross-section. His three legs, which symbolize the Serbian tripod (a type of antique wooden chair), are articulated on concrete foundations, which was 1.4 m buried in the ground. The height of the reinforced concrete tower (without steel antenna) was 137 m, which means it rose 575.91 m above the sea. With a steel antenna it had a total height of 202.87 m and at that moment it was one of the top ten towers in the world. Static solutions and constructions of engineers Milan Krstić are original in world architecture. In addition to being one of the few towers in the world that was not buried in the ground (it was set on a three-pointed support), the great characteristic of it was that it was lifted without a scaffold (sliding formwork), inside, and during construction it looked like it “grow itself”. It has 4,000 tons of reinforced concrete in it, and it contained a triangular steel antenna column, 65 m high and weighing 25 tons. The Tower of Avala was one of the highest and most modern telecommunication facilities in Europe.
Broadcasting transmitters were, initially, in the hall, within a gondola, at a height of 115 m, but due to the cooling problem, they were lowered into the broadcasting hall, on the ground floor. The latest world-wide achievements in the field of telecommunication technologies, at that moment, were among the first ones installed on the Avala tower. The experts of Transmitters and communications installed first, in 1964, a 10 kW VHF Transmitter “Siemens” for broadcasting the First Television Program, and then two 20 kW FM transmitters RIZ for the First and Second Radio Program of Radio Belgrade. In Avala, in 1971, the introduction of the Second TV program in the Republic of Serbia started. For these purposes, it was necessary to upgrade the antenna system to the corresponding transmitter at the top of the tower, thus reaching its tower height of 202.87 m at that time. At the same time, a 40 kw UHF transmitter, NERA, was installed, which was replaced in 1975 by a more modern transmitter of GATES 40 kW.