On the massive public housing block at Luckweg/Marienfelder Allee 178, Berlin-Marienfelde, besides o2 3G, Telekom has come up with a widespread antenna configuration. The hardware on the neighbouring 182 is Vodafone's though.
Seen from the south end of Luckeweg:
View from Ahrensdorfer Straße south:
Seen from the south-east at Marienfelder Allee: