Are you 100% sure about that?
It looks to me as a omnidirectional antenna in a protection dome.
Militaries use these to listen to international radio conversations.

You seem to be right in general, it is a radome, which is a mostly military used device. But radomes are also used for such usual purposes as to protect antennas from ice. This one is part of the Erdfunkstelle Raisting, which was formerly used by the state telecommunication company Deutsche Telekom and is now owned by the American company "Emerging Markets Communications Inc. (EMC)", which provides telecommunication for humanitary NGOs and the UN. The radome itself isn´t used any more, it only stands there as an architectural monument. You can even go inside.

About Raisting (unfortunately only in German): de.wikipedia.org/wiki/Erdfunkstelle_Raisting
About radomes: en.wikipedia.org/wiki/Radome

By the way, this is a wonderful picture: de.wikipedia.org/wiki/Datei:Erdfunkstelle_Raisting_5.jpg

Thank you for your reply. You know, I used to write articles about telecommunications, hence my curiosity. :-)