All mobile CB antenna mounts - with the exception of No Ground systems - require a counterpoise, or reflective ground plane. Most of the time, this is the metal frame and/or body of the vehicle the antenna mount is located. Since the metal in your vehicle is half of a functioning antenna system, you NEED to make sure your antenna mount is grounded. In situations where a ground strap is needed, make sure to connect to the antenna mount - not the antenna stud or the antenna. Also keep ground straps as short as possible to be effective. Base station antennas and no ground antennas do not need to be grounded.