Abstract: The apparatus of the present invention provides on-board detection systems such as automotive CAS radars the ability to react to small aspect ratio targets at an off angle to the road greatly increasing the ability of the operator of a vehicle to avoid a collision with cyclists, motorcycles, mobility devices, pedestrians and other difficult aspect ratio targets. The apparatus of the present invention is passive and can be adapted to a number of mounting schemes covering a broad spectrum of small aspect ratio targets. Examples include mounting the apparatus to the frame of a bicycle, the fender of a motorized mobility device, a motorcycle or attached to the crutch or walking stick of a pedestrian.