The present invention is directed to a dual band, omni-directional antenna having a symmetrical radiating structure defined by a pair of conductive portions interconnected by a tuning bridge formed on a printed circuit board. An outer housing holds the circuit board in place. An adhesive layer is used to secure the antenna to a dielectric, such as the rear window of an automobile. The antenna housing incudes an outer surface includes a plurality of surface interruptions in the form of ridges and valleys that render the housing flexible so that it may conform to the shape of different mounting surfaces. The tuning bridge of the antenna permits tuning of the resonant frequency bands for the radiating structure to define two separate and distinct, selectable frequency bands.