Radio frequency communications system

An RF communications system for communicating between a plurality of base stations and subscriber units within a plurality of contiguous geographic sectors comprising:

• a plurality of frequency groups, each group being utilized for communication in a selected sector between a selected base station and a plurality of subscriber units;
• a primary base station having a plurality of primary directional antennas, each for servicing a separate primary one of the geographic sectors;
• said primary antennas being disposed together at a fixed location proximate a common corner of the primary sectors which they service;
• a first of said primary antennas for servicing a first of said primary sectors being directed substantially away from the direction of a second of said primary antennas which services a second of said primary sectors;
• a first of said frequency groups being utilized for communication in said first primary sector between said primary base station and a subscriber unit in said first primary sector;
• each of a plurality of secondary base stations having a plurality of secondary directional antennas, each for servicing a separate secondary one of the geographic sectors;
• said secondary antennas of each secondary base station being disposed together at a fixed location proximate a common corner of the secondary sectors and one of said primary sectors and being directed substantially away from said primary antennas;
• the locations of said secondary antennas being substantially concentric about the location of said primary antennas;
• at least a first of said secondary base stations having secondary antennas disposed together at a fixed location proximate a common corner with said first primary sector;
• said first secondary base station having a first secondary antenna for servicing a first of said secondary sectors being directed substantially away from the location of said primary antennas;
• and
• a second of said frequency groups being utilized for communication in both said first secondary sector and said second primary sector such that a single frequency of said second group can be simultaneously utilized for separate communications, one between said first secondary base station and a subscriber unit in said first secondary sector and one between said primary base station and a subscriber unit in said second primary sector.