# Listening station

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"Listening post" redirects here. For the Al Jazeera English programme, see [The Listening Post](/source/The_Listening_Post).

A [radio](/source/Radio) **listening station** (also: listening post, radio intercept station or wireless intercept station, W/T station for [wireless telegraphy](/source/Wireless_telegraphy)) is a facility used for military [reconnaissance](/source/Reconnaissance), especially [telecommunications](/source/Telecommunications) reconnaissance (also known as *[signals intelligence](/source/Signals_intelligence) SIGINT*) by "intercepting" radio [transmitter](/source/Transmitter) communications. In contrast to the original [eavesdropping](/source/Eavesdropping) on an [acoustic](/source/Acoustics) [speech](/source/Speech) conversation, radio eavesdropping stations are used to eavesdrop on the [information](/source/Information) transmitted [wirelessly](/source/Wireless) using [radio](/source/Radio) technology. For this purpose, highly sensitive [radio receivers](/source/Radio_receivers) and suitable [receiving antennas](/source/Antenna_(radio)) are used (see images).

## First World War

After [Heinrich Hertz](/source/Heinrich_Hertz) (1857–1894) succeeded in 1886 as the first to generate electromagnetic waves in the [ultra-short wave](/source/Shortwave_radio) range, and [Guglielmo Marconi](/source/Guglielmo_Marconi) (1874–1937) around 1900 was able to increase the range of his radio transmissions to hundreds of kilometers, thus [radiotelegraphy](/source/Radiotelegraphy) technology was used in the [First World War](/source/World_War_I) (1914–1918), for example: within the [German Imperial Army](/source/German_Army_(German_Empire)), the [Imperial Russian Army](/source/Imperial_Russian_Army) (with fatal consequences in the [Battle of Tannenberg](/source/Battle_of_Tannenberg) due to intercepted Russian radiogram traffic by Germany and Austria),[1] and in [aeronautical](/source/Aeronautical) radio communication. Conversely, France was already using the [Eiffel Tower](/source/Eiffel_Tower), which was closed to the public during the first year of the War, as a radio listening station to intercept [wireless telegraphy](/source/Wireless_telegraphy) (see image). There, in addition to other French listening stations, encrypted wireless telegraphy messages from the German [western front](/source/Western_Front_(World_War_I)) were intercepted, the message content of which would later be deciphered, notably by Frenchman [Georges Painvin](/source/Georges_Painvin). This includes the so-called [Radiogram of Victory](/source/Georges_Painvin#The_"Radiogram_of_Victory") (*Radiogramme de la Victoire*); the [ADFGVX-telegram cipher](/source/ADFGVX_cipher) used by the German Imperial Army.

## Second World War

In the [interwar period](/source/Interwar_period) between the end of [World War I](/source/World_War_I) and the beginning of [World War II](/source/World_War_II), [radio](/source/Radio) technology had developed considerably and was now used extensively by all warring parties. Detection and evaluation of radio transmissions had become all the more important and were operated by all sides. The encrypted German communications ([Enigma](/source/Enigma_machine), [Lorenz](/source/Lorenz_cipher), etc.), which were intercepted by British radio listening stations around the world, were of vital importance to the war effort.

Dozens of so-called Government Communications Wireless Stations (GCWS), or [Y-stations](/source/Y-stations) for short which had initially been established during [World War I](/source/World_War_I),[2] and the [Admiralty Civilian Shore Wireless Service](/source/Admiralty_Civilian_Shore_Wireless_Service) (ACSWS), were used by the British for this purpose, in [Great Britain](/source/Great_Britain) and elsewhere. [German Intercept Station Operations during World War II](/source/German_Intercept_Station_Operations_during_World_War_II) were comparable, albeit less effective, in the form of the [General der Nachrichtenaufklärung](/source/General_der_Nachrichtenaufkl%C3%A4rung) (General Intelligence Service) of the [German Army](/source/German_Army_(1935%E2%80%931945)) and the [B-Dienst](/source/B-Dienst) (observation service) of the [Kriegsmarine](/source/Kriegsmarine) (German Navy).

## Cold War

With the approach of the [Cold War](/source/Cold_War), modern radio listening stations established themselves on both sides of the [Iron Curtain](/source/Iron_Curtain), especially in the divided [Allied-occupied Germany](/source/Allied-occupied_Germany). Up until 1989, for example, there were two powerful monitoring systems on the summit of the [Brocken](/source/Brocken), which lies directly on the former [inner German border](/source/Inner_German_border). One belonged to the Soviet military secret service [GRU](/source/GRU_(Soviet_Union)) and was thus also the westernmost outpost of the [Soviet Union](/source/Soviet_Union), the other was subordinate to the main Department III (radio reconnaissance, radio defense) of the Ministry for State Security ([Stasi](/source/Stasi)) of the [German Democratic Republic](/source/German_Democratic_Republic) (GDR). The stations had the code names "Yenisei" and "Urian", the latter colloquially known as the "[Stasi mosque](/source/Brocken_House)" (*Stasi-Moschee*). After 1989, a much larger listening complex was planned on the Brocken summit, which was no longer implemented due to the fall of the [Berlin Wall](/source/Berlin_Wall) and the [peaceful revolution](/source/Peaceful_revolution) in the German Democratic Republic.

During the Cold War period, the [United States Army Security Agency](/source/United_States_Army_Security_Agency) built an airspace surveillance and listening station on the man-made hill called [Teufelsberg](/source/Teufelsberg), located in the former [West Berlin](/source/West_Berlin) region of [West Germany](/source/West_Germany), to listen to Soviet, East German and other [Warsaw Pact](/source/Warsaw_Pact) nations' military radio communications traffic.[3][4] The listening station named Field Station Berlin (also known as USM 620 Kilo) was mainly operated by the US [National Security Agency](/source/National_Security_Agency) (NSA) and served as part of the worldwide surveillance network [ECHELON](/source/ECHELON).[4] The installation was also shared with the [British Army](/source/British_Army) 26th Signal Battalion and [13th Signal Regiment](/source/13th_Signal_Regiment_(United_Kingdom)) since it was located in the [British occupation zone](/source/British_occupation_zone). During the [German reunification](/source/German_reunification) process in 1989 and 1990, the facility's electronic equipment was removed and the amassed [classified information](/source/Classified_information) archives destroyed as it had become redundant with the end of the Cold War. In 1991 the US and British withdrew from Teufelsberg, and the [Senate of Berlin](/source/Senate_of_Berlin) sold the 4.7-hectare (12-acre) area of the listening station for 5.2 million [Deutsch Mark](/source/Deutsch_Mark) to a private investor consortium.[3][4]

A so-called "listening station" in the corner building on *Mittelstrasse/Neustädtische Kirchstrasse* in [Berlin centre](/source/Mitte_(locality)) (*Mitte*-district), was believed to have been used between 1977 and 1989 by the East German Ministry for State Security ([Stasi](/source/Stasi)) to listen to the [American embassy](/source/Embassy_of_the_United_States,_Berlin) on the opposite side of the street.[5]

## Post-Cold War

The [superpowers](/source/Superpowers) and their allies in particular still operate a wide-ranging network of eavesdropping listening stations around the world. One of the most famous is [ECHELON](/source/ECHELON), which is operated by the [intelligence agencies](/source/Intelligence_agency) of the [United States](/source/United_States), [United Kingdom](/source/United_Kingdom), [Canada](/source/Canada), [Australia](/source/Australia), and [New Zealand](/source/New_Zealand). Another is the Swiss [Onyx interception system](/source/Onyx_(interception_system)), and [Frenchelon](/source/Frenchelon) used by [France](/source/France).

Stationary radio listening stations in [Germany](/source/Germany) are, for example, the [Federal Intelligence Service](/source/Federal_Intelligence_Service) (BND) outposts located in [Bad Aibling](/source/Bad_Aibling_Station) and [Gablingen](/source/USASA_Field_Station_Augsburg); both are former US listening stations built during the Cold War in [Allied-occupied Germany](/source/Allied-occupied_Germany) and are now operated by the German Federal Intelligence Service (BND). In [England](/source/England), [RAF Menwith Hill](/source/RAF_Menwith_Hill) should be mentioned,[6] including [BBC Monitoring](/source/BBC_Monitoring) at [Crowsley Park](/source/Crowsley_Park) and [Government Communications Headquarters](/source/Government_Communications_Headquarters) (GCHQ) in [Cheltenham](/source/Cheltenham).

There are also mobile radio listening stations, such as specially adapted radio intercept road vehicles and mobile field tent stations,[7][8][9] [reconnaissance ships](/source/Spy_ship) or special [reconnaissance aircraft](/source/Reconnaissance_aircraft) for telecommunication reconnaissance.[7]

## Literature

- Wilhelm Flicke: *The Beginnings of Radio Intercept in World War I.* [www.nsa.gov](https://www.nsa.gov/Portals/70/documents/news-features/declassified-documents/cryptologic-spectrum/beginnings_radio_intercept.pdf) (PDF)
- Michael E. Bigelow: *A Short History of Army Intelligence* [fas.org](https://fas.org/irp/agency/army/short.pdf) (PDF)
- David Kahn: *The Naval Intercept Station at Bainbridge Island, Washington.* [Cryptologia](/source/Cryptologia), 38:244–247, 2014, [\[1\]](https://www.tandfonline.com/doi/abs/10.1080/01611194.2014.915677)
- Kenneth Macksey: *The Searchers – Radio Intercept in Two World Wars.* Cassell Military Paperbacks, London 2004, ISBN 978-0304366514

## See also

- [List of established military terms](/source/List_of_established_military_terms)
- [Signals intelligence](/source/Signals_intelligence)
- [Ground station](/source/Ground_station)
- [ECHELON](/source/ECHELON)
- [Frenchelon](/source/Frenchelon)
- [Pine Gap](/source/Pine_Gap)
- [Chopmist Hill Listening Post](/source/Chopmist_Hill_Listening_Post)
- UKUSA listening stations

## References

1. Flicke, Wilhelm (1978). ["The Beginnings of Radio Intercept in World War 1: A brief history by a German intelligence officer"](https://www.nsa.gov/portals/75/documents/news-features/declassified-documents/cryptologic-spectrum/beginnings_radio_intercept.pdf). *NSA Cryptologic Spectrum*

1. [Y-stations in World War I](http://antiqueradios.com/chrs/journal/intelligence.html)

1. Walsh, Alistair (3 November 2018). ["Berlin's Teufelsberg listening station to be historical monument"](https://www.dw.com/en/berlins-teufelsberg-listening-station-to-be-historical-monument/a-46147018). *[Deutsche Welle](/source/Deutsche_Welle)*. Retrieved 16 January 2021.

1. ["Teufelsberg; Field Station Berlin: NSA spy station on buried Nazi college"](https://www.abandonedberlin.com/teufelsberg/). *Abandoned Berlin*. 23 April 2020. Retrieved 16 January 2021.

1. Westphal, Dirk (12 January 2014). ["Die Abhörstation; An der Mittelstraße Unterhielt die Stasi einen Horchposten, von dem aus sie die Botschaft der USA überwachte. Nun wird dort Kunst inszeniert."](http://abhoerstation.com/pdf/WAMS_12-1-2014.pdf) [The listening station; The Stasi maintained a listening post on Mittelstrasse, from which they monitored the US Embassy. Now art is being staged there.] (in German). *[Welt am Sonntag](/source/Welt_am_Sonntag)*. No. 2. Retrieved 17 December 2020.

1. Norton-Taylor, Richard (1 March 2012). ["Menwith Hill eavesdropping base undergoes massive expansion"](https://www.theguardian.com/world/2012/mar/01/menwith-hill-eavesdropping-base-expansion). *[The Guardian](/source/The_Guardian)*. Retrieved 11 February 2021.

1. Bigelow, Michael. ["A Short History of Army Intelligence"](https://fas.org/irp/agency/army/short.pdf). *[Federation Of American Scientists](/source/Federation_Of_American_Scientists)*. Washington. Retrieved 11 February 2021.

1. ["Revealed: Britain's 'secret listening post in the heart of Berlin'"](https://www.independent.co.uk/news/uk/home-news/revealed-britain-s-secret-listening-post-heart-berlin-8921548.html). *[The Independent](/source/The_Independent)*. 5 November 2013. Retrieved 11 February 2021.

1. Beaumont, Peter (20 December 2019). ["Cyprus police arrest three in Israeli-owned 'spy van' investigation"](https://www.theguardian.com/world/2019/dec/20/cyprus-police-arrest-three-in-israeli-owned-spy-van-investigation). *[The Guardian](/source/The_Guardian)*. Retrieved 11 February 2021.

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Adapted from the Wikipedia article [Listening station](https://en.wikipedia.org/wiki/Listening_station) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Listening_station?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.