The product is nothing spectacular, its a magnetic base with a SMA port to connect to another Alfa product. The magnet is strong and will have no problem staying put on the roof of a car. The cable length is 40 inches with a RP SMA plug port (whole in nut instead of rod). The diameter of the magnetic base is just shy of 2.5 inches. The connector on the base is a RP SMA jack (barrel with pin) and has a rubber o-ring for weatherproofing while on top of vehicle. The antenna is 15 and 3/8 inches long and looks like a sharpie at its thickest point, tapering downward to the tip.