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On the very prominent and massive masts that reach into the sky over Dorotheenstraße, o2 has B20-only-LTE antennas that also do GSM (1800 MH) and UMTS (2100 Mhz), next to Telekom and Vodafone antennas.

seen from east

rear view

seen from west

the antennas can even be seen from Platz des 18. März in front of the Brandenburger Tor