the ''mini coax'' IS the diversity antenna cable....the connection between the
E82 diversity antenna - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
Replacing BMW E91 Diversity Amplifier - YouTube
Key fob working intermittently - diversity antenna? - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
E91 Diversity Antenna - BMW 3-Series (E90 E92) Forum
Antenna amplifier, Diversity - BMW E82 / E90 / E92 - BMW Recambios
Original BMW Antenna cable Diversity NG 3er E90 3635MM | HUBAUER-Shop.de
E91 key fob fix (not antenna) | BimmerFest BMW Forum