Community antenna television began as a service to isolated communities without television programming. In the ensuing years~ the scope of cable TV has increased to the point where now large metropolitan areas find it expedient to use CATV to provide high equality television. Figure 1 illustrates how large metropolitan areas may be serviced from a single transmitter site using microwave links~ to carry television signals to individual microwave receivers located strategically within the metropolitan complex. From these receivers, cable systems deliver the television programming to individual subscribers.