A base station for a mobile communications system, a mobile communications system including the base station and a method of increasing base station capacity. Each base station antenna is coupled to a transmission line that may be connected to a triplexer. The triplexer separates uplink signals from a duplex signal on the transmission line. The uplink and downlink signals are both in two sub-bands that are separated by a third sub-band. The triplexer passes the uplink signal to a duplexer/combiner that forwards the uplink signal to a combiner. The duplexer/combiner and combiner each pass downlink signals in one of the sub-bands to the triplexer, which combines the passes to the duplex signal.
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