You are right!
The shield is not grounded so it can be and is used as antenna.

I need to get my to complicated english/german lost in translation right...
As you can see i edit nearly all of my posts and juggle sentences to make them more understandable, now i actually dropped a "un" in front of shielded... geez... the sentence was "it is not possible with unshielded cable" but i discarded that and turned it around...

Going to leave it to not let your correction look awkward.
Thanks, i appreciate it as you know.