I used the visor clip for many years. You are referring to the dark band at the top of the windshield? I don`t think that has any effect on radar, although it may on laser. The problem for radar is the heated windshields or "solar barrier windshields of the type used on GM Venture-Montana-Silhouette-Trans Sport minivans and on some imported luxury sedans (look for a reddish or copper tint)" as quoted from the V1 manual. These windshields have a thin metallic coating on them that will partially reflect the radar.
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