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Lots of directional radio antennas power o2's (in early 2021) 5G-N78- and 4G-enabled sector antennas, that are on top of a high building close to the end of Kitzingstraße, Mariendorf. It gained a second antenna per sector for Band 3 in mid-2019. In early 2020, Commscope antennas show up at the here vacant masts no longer used by E-Plus, in order to eventually go live as a Telekom site in very early 2021.
Seen from the south-west at Trachenbergring:
View from the north at Lankwitzer Straße:
Seen from the west at Haynauer Straße 56:
...compared to old photos from August and March 2019: