an antenna mount includes a frame formed by a front plate and a rear plate connected by a separator , which has a concave seat centrally located on its upper surface . a rotator element is pivotally secured between the front and rear plates , and is rotatable either clockwise or counterclockwise through the support frame . the upper portion of the rotator has a threaded opening into which an antenna can be mounted , while a spring mounted piston is provided at the bottom end of the rotator . when an antenna is mounted in the rotator and is upright , the piston is securely engaged on the seat . the antenna mount is installed on a vehicle so that upon encountering an obstacle while moving either forward or backward , the spring mounted piston becomes disengaged from the seat , causing the rotator and antenna to pivot either forward or backward in response to the force . the antenna can be reset by lifting the antenna until the antenna mount returns to a locked position and the antenna is again upright .