The transmission tower built in 1939 is a 43.31 metre high free-standing cylindrical tower built of steel concrete, which carried until the beginning of the nineties similar to Gerbrandy Tower a guyed steel tube mast on its top. This mast carried the FM- and TV-broadcasting aerials.
Nowadays this mast is demounted and there are only small aerials for mobile phone services on its top. The tower is nicknamed because of its cylindrical form "thermos flask".
The transmission tower built in 1974 is a 126 metre tall free standing steel tube tower on three feet. This tower which is similar to the tower of transmitter Brocken, which was built at the same time, carries above its legs three platforms for aerials for directional radio services and in its topmost section, protected by layers of glass-reinforced plastic, transmission aerials for FM broadcasting services and TV.
Signals transmitted from Inselsberg
- ARD (originally DFF1), VHF channel E5 (Horizontal) 100 kW
- MDR 3rd Programme (originally DFF2), UHF channel 31 (Horizontal) 500 kW
- VHF-Tower on the Great Inselsberg at Structurae
- Great Inselsberg Transmission Tower at Structurae