Heres the short story, I mounted a M45 on a 2006 Viper Coupe today. All 4 heads are on the front of the car. I did recess them inside of the front bumber. There in nothing in front of them like a grill or anything but they are recessed about 3 to 5 inched back. I called a couple cop buddies and went out to test. I could not get it to alert off of a TV remote. I was very dissappointed. Against a Pro Laser III, it got me no problem. Did better against a ultralite 20 / 20 or something like that. I have a concern thought. I pointed the LIDAR gun point blank at a couple of the sensors with no alert. One would always trigger the alarm but the 3 others did not. I know the wires are okay, I did have alot of extra and I zipped tried it very nice, and I left it loose. Any ideas, I plan on moving the sensors farther out to see, but the gun not setting off the sensor that close puzzles me.