Extending Homematic CCU2 Range

I had one problem with the Homematic CCU2: The radio range.

Some actors or sensors kept having connection issues and some others simply were out of the radio range. The goal was to get a power adapter connected 2 levels under our apartment and get rid of all those warning messages.

Cosnidering the small antenna of the Homematic CCU2 in the below pictures (yes, this tiny black thing is the …

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