I have tried three antennas till now, two Chinese antennas, and one OEM.
One Chinese antenna was able to detect that I am driving on the road and not in the middle of jungle when I put it outside over the roof sticking magnetically.
The OEM antenna fluctuates the altitude from 20000 meters to -17meters randomly while driving.
In OBDEleven, I have open circuit for DAB, where the GPS antenna status is OK. If I remove the antenna, OBDEleven scan shows open circuit for antenna too.
Checked, It is plugged to correct port, the port for DAB has different plastic edges so it doesn't fit there.
My antenna cable is 5 meter long (amazon purchased) that I suspect could be culprit, though I checked the continuity and if there is any short-circuit using my multi-tester. The cable looks ok. However, I think using 5 meter cable and making a huge loop of cable to make it shorter might cause some loss of signal.
Any other suggestions are welcome.
I checked 5F adaptations ( gps, galileo, glonass,compass set to on).
In GEM, shows 'Antenna OK, No fix. '
I heard from some folks over VW forum that GEM was causing some issues with navigation, so I disabled the GEM too.
I have a guy helping me check my antenna and cable on his seat Leon to filter the causes. Will keep posting..