I had an M25 Extreme installed professionally the other day. The guy who sold it to me, has his installed behind the honeycomb grill at the front bottom of his car. He has been alerted and saved about 12 times over the past year. I had mine installed the same way by the same installer. They were perfectly levelled and aiming straight out. The guy who did the install was very thorough. I only did it this way because any jammer(s) are illegal here. How much of an imapct either in detection or ability to jam will it have with the transponders behind the honeycomb grill? There are three vertical pieces of the honeycomb grill, less than 1/4 " in width each, spaced out evenly, in front of the transponders. Other than that, it's completely clear to the road ahead. Any info. would be appreciated.