I don't have a lot of knowledge of rd, but I believe they are basically based on line of sight. For a rd to detect the presence of radar or laser the detector has to be able to sort of see the laser or radar signal. I have a convertable with a very small rear window, so I am thinking I will have a significant blind spot from behind unless the rd picks up a signal bouncing off of some other object. Am I thinking correctly? By the way, great sight here.