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act like a wind dam and then the other way it'll act like a wind catcher. But people put them on top of their cars when they've got brackets that they put them in and they have those brackets tied down pretty good and they have them just pointing straight up. I've seen some other advertisements where they've got this one thing where it's got two section cups only and they put it on windshield on the dash but they have the section cups in the front so you can make that thing flat so it's pointing more northward on our trip to California. I bought a holder and I put it on the sun roof or the sun roof.