after a little repair the antenna works great

Since a return is not worth for the price, I have made myself to the search for the cause.

Since the antenna inside is painted seems a contact problem between the foot and the actual antenna to exist.

I then unscrewed the antenna and the cavity located below long filled with aluminum foil to
when reindrehen the foot on the last millimeter of the rotation a slight resistance was felt. This was the
Once compressed aluminum and the contact with the thread made safe.

By repeatedly off and turn again rotate the antenna at the base also is the paint on the inside of the thread part
abraded and thus also the contact with the foot securely in place.

The Result; The reception quality has changed from moderate to phenomenal.

One point deduction because only a repair needed to be carried out.