In simulcast systems, overlapping coverage areas (111, 113, 115, and 117) of base sites (101, 103, 105, and 107) result in distortion of the received signal to any communication unit (121 and 125) within the overlapping area. This distortion occurs because the signals are not completely time and frequency aligned when they reach the communication unit (121 and 125) due to differences in distance and geographical obstructions between the transmitters and the receiving unit. A simulcast system is provided that uses unique base site IDs to allow mobile units to locate themselves within the system. This ID system is also used to assign one site to a mobile unit (121 and 125) residing in an overlapping area, and thereafter to identify the minimum number of base sites needed for a transmission to all the relevant communication units (119, 121, 123, 125, and 127). Only those base sites (101, 105, and 107) needed to complete a transmission are enabled, eliminating distortion to units (121) in overlapping areas.