When it comes to mobile summing with direction finders, one can use a single mobile summer on different bands by manually switching the antennas. However, in some applications it is desirable to switch antennas on the fly without getting out of the vehicle.  We offer mobile summers with integral antenna switching that covers the entire 100 – 1000 MHz frequency.  For example, the diagram below shows the equipment necessary for one, two, and three antenna sets.