Bunker Kagel, Cold War intelligence bunker in Grünheide, Germany.

Bunker Kagel, also called Funksendezentrale Kagel, is a three-storey structure of about 35 by 50 metres between Lichtenow and Kagel, 12 km south of Strausberg. Its first floor sits above ground, while the second and third floors lie beneath the surface. The wider radio-transmitting site covered roughly 40 hectares, most of it an antenna field for 40 different antenna systems, including underground ones.

The bunker was planned in the late 1950s and completed in 1961 as East Germany expanded its surveillance network. The structure was built during a time when political tensions between East and West were steadily rising.

The site was a radio transmitting centre of the Hauptnachrichtenzentrale of the Ministry of National Defence, not a listening post. Its roughly 40-hectare antenna field held 40 different antenna systems, including underground ones, and a 32-metre steel lattice mast for VHF and directional radio. Transmitters of up to 5 kW, mostly KN 1E and KSS 1300 types from VEB Funkwerk Köpenick, were remote-controlled from the Strausberg bunker. The bunker is now privately owned and cannot be visited.

The bunker is privately owned and cannot be visited, so there are no tours, no opening times and no access to the three floors or the former antenna field. The site lies between Lichtenow and Kagel, about 12 km south of Strausberg in Märkisch-Oderland, Brandenburg. What remains visible from outside is the fenced former radio transmission centre area of roughly 40 hectares.

The bunker was the first built in the GDR, started in the late 1950s and finished in 1961. Its three floors covered about 35 by 50 metres, with only the ground floor above the earth. The wider radio station site of roughly 40 hectares held 40 different antenna systems, including underground ones, and a 32-metre steel lattice mast.