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Near the S Bahn Railway between S Marienfelde and S Buckower Chaussee, between Telekom eNB ID 111138 and Vodafone eNB ID 13885, o2 has placed a site for LTE at Band 20 only on top of a workshop building.
Seen from the end of Wehnertraße. o2's sends probably from the single Kathrein panels holding masts: