This video shows the importance of the mass connection when sticking a DAB+ antenna to your car windscreen. Speech is Dutch but images speak for themselves.
I removed the pillar trim and then glued the antenna to the screen. The car is Skoda, the Android radio is Joying JY-VO130P2 and the DAB+ radio app is DAB-Z (a free good working app).
![](https://i.ytimg.com/vi/H84T6JR-iZM/mqdefault.jpg)