Although no system is 100 percent effective, there are several good models on the market to help evade the notice of a radar gun. Cobra, Escort, Whistler, BEL, and Valentine are among the most popular brands of radar detectors for speed demons and electronic enthusiasts.Cobra Radar DetectorsCobra radar detectors are a customer favorite. They have high sensitivity, especially while in ""highway"" mode. Cobra detectors claim to produce few false alarms, though this function takes a few minutes to.