The present invention relates to a mounted antenna for use in a wireless communication system, and in particular, to a mounting device and associated method for mounting an antenna within a cavity of a finished wall. The mounting device comprises a platform and a plurality of support legs, each of the plurality of support legs having a free end and a fixed end. The fixed end is pivotally coupled to the platform. The platform has a coupling mechanism for attaching an antenna to the platform. The mounting device also includes a biasing element for supplying a constant force to the plurality of support legs sufficient to propel the free end of each support leg in an outwardly direction from the platform and engage a surface within a wall cavity to support the mounting device.