For the Dutchies (to stay on the legal side);
I'm almost buying a Target EUR 550, but have to make sure it will work...
Does the windshield of 147 jam the signal for radar detectors, or can I use a window-fitted detector.
I have heard people saying some windshield will block radar signals so that the detector will not pick up & warn me...
Otherwise, I have to buy a Ventura
costing mucho flappo 
I'm almost buying a Target EUR 550, but have to make sure it will work...
Does the windshield of 147 jam the signal for radar detectors, or can I use a window-fitted detector.
Otherwise, I have to buy a Ventura