Having finally gotten the old Aluantenne (thanks Seat for this "great" anti-theft protection), however, came the disillusionment. If the thread adapter completely screwed into the antenna, it is too short to fit into the socket.
So I screwed the threaded adapter from the antenna and first into the socket. However, only 2-3 threads. After antenna was as far as possible it screwed.
Thus the antenna has finally held, but the reception was a bit worse than the production model (probably due to the small contact area between the adapter and socket).
After a few days, I then turned myself a longer threaded adapter and could improve a little, although he still does not quite get there at the old Aluantenne so the reception. In addition, I have now are no longer afraid that the antenna but maybe sometime loosens and flies away.
All in all it is still a good and smart antenna, which looks a lot better than the old one.