does not do it in the car (Chevy van, Pontiac GP or the BMW) only on the bike.... I have no idea of the wavelength of the radar but the only thing other than the fake CF DB windscreen would be maybe EFI from the HID ballasts some how? but the problem is intermittent and I am still trying to put all the puzzle pieces together when it does it.. I thought it was reflected light (could still be) but I have not run it at night yet (still a bit chilly here)Hmm, did you try it in your cage to see if you have the same problem