Marnach transmitter was a broadcasting facility of RTL near Marnach in the commune of Munshausen, in northern Luxembourg. The Marnach transmitter was built in 1955 for improving the transmission of the English-speaking program on 1439 kHz , which was transmitted from 1951 with an omnidirectional antenna from Junglinster, to the British Isles and for a better transmission on this frequency to Germany at daytime. Therefore, it was given a directional antenna with a switchable directional characteristic pointing North-northeast towards the Rhine-Ruhr area, Germany's most populated area, and West-northwest in the direction of the UK. This antenna was implemented in form of a directional antenna consisting of three ground-fed 105-metre tall guyed mast antennas arranged in the form of an isosceles triangle with a 90 degree angle. As transmitters, two 100 kW units switched in parallel were used when it went in service in December 1955.
In 1956 the transmission power of the Marnach mediumwave transmitter, which worked until 1978 on 1439 kHz and then on 1440 kHz was increased to 350 kW after the mediumwave transmitter of Junglinster was moved to Marnach. On July 15, 1957 the German-speaking program, which rapidly became very popular, started. In April 1958 the regular program service started, which was a German programme in the daytime and the famous English program “2-0-8” in the evening and nighttime.
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