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Since many years there is a mysterious station, hidden in a forest very close to Rhein-Main Airport Frankfurt. Frankfurt has been an active part of american intelligence services since the end of world war II, with the general consulate in the city, the big military part of the airport, and - the transmitting station in the forest (50 N 01'13" - 08 E 36'41"). If you watch e.g. Google Earth, use the 'history' function to show pictures of older date, they show more ;-)

It is said, that from this US government station many so-called 'spy' stations (number stations) were working, also diplomatic traffic. Clearly, these are shortwave transmitting antennas, for whatever services. Probably, parts were used for the USAF air base at Rhein-Main airport (now closed), but others certainly from sources like NSA or CIA - you'll never know...

 

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impressive antenna array...
...with directional elements for HF, VHF, SHF, and more...
...behind a fence, close to the airport...
...here a logarithmic-periodic antenna, beaming ~north...
...and here a suggestion for your garden at home ;-) (all above: rb, 2010)
a birds-eye view from a helicopter, photographed 2014 by Michael Marten (also used for the cover of his 2015/2016 edition of 'Spezial Frequenz Liste')

 

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