: Please note the antenna may be the culprit, since it is integrated in : the rear windshield.
: Any kind of help and feedback is greatly appreciated.
This is the main problem. Windshield antennas are *lousy* for reception.
Getting the best receiver in the world and having a windshield antenna hobbles the front end of the receiver. One possible remedy would be to install a conventional telescopic antenna.
Additionally, windshield antennas are somewhat directional, giving signal variation with change in direction.
Good for car manufacturers, bad for radio listeners.
b.