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Antenna tuning hut

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Helix building
Helix building of the backup tower for Blosenbergturm in Beromünster.
Helix building under a radio tower.
Helix building under the backup tower in Beromünster.

A helix building is a small structure at the base of a longwave or mediumwave radio transmitter. Within, there are capacitors and coils for coupling the signal from the feed cable to the antenna.[1] The building may also contain lightning protection devices. Active components such as amplifiers are usually not housed in a helix building.

The interior of the helix building is typically covered with copper or aluminum, in order to control stray radiation.

In operation the components can have a voltage of several hundred thousand volts. The electromagnetic fields can heat up animals and humans like a diathermy device.

The helix building, which may be a simple switchbox for small transmitters, is usually next to the transmitting antenna array, but in some cases it can be the base of a mast radiator.

See also


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  1. ^ Nachrichten-Elektronik. Fachzeitschrift der internationalen Nachrichtentechnik. Band 5. Elektro-Welt-Verlag Dr. Hüthig. 1951. p. 13.
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