An external rear view mirror for motor vehicles, particularly commercial trucks, includes a support arm and mounting devices for mounting the support arm to the motor vehicle. A housing defining an interior volume is provided with the support arm having a vertical portion extending completely through the housing interior volume. At least one support plate is removably attached directly to the support arm vertical portion. An adjustable mirror assembly is mounted to the support plate front side so as to be variably positionable relative thereto. An antenna mounting bracket is formed integral with and extends from the support plate back side into the housing interior volume. The antenna mounting bracket is configured for receipt of an antenna which extends out of the housing. The entire weight of the antenna and the antenna mounting bracket is supported by the support plate which is in turn attached directly to the support arm.