From http://en.wikipedia.org/wiki/Blosenbergturm
The Blosenbergturm is a transmitting tower in Beromünster, Canton of Lucerne, Switzerland, built in 1937 for the German language radio station DRS and sending at an AM frequency of 531 kHz marking the down end of the official mediumwave broadcasting range. The Blosenbergturm has a height of 150 m and is a self-radiating tower insulated against ground, i.e. the entire tower structure is used as an antenna. It has a cabin at a height of 150 m, containing a coil for feeding the pinnacle, which is insulated against the rest of the tower, separately with high frequency power. By this cabin it has similar proportions as Fernsehturm Stuttgart. Originally the tower was used as dipole antenna, whereby the feeding point was in the cabin. There is a second 126 metre tall freestanding lattice tower nearby, which is as Blosenbergturm a tower radiator insulated against ground
The Beromuenster transmitter has been shut down on December 28th, 2008, at midnight (CET).
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