TX/RX's 43-83G-01A-08 746 – 869 MHz, multi-channel control station combiners provide frequency-agile operation across their entire frequency range. control station combiners may be used to reduce the number of antennas required on a communications site while also ensuring that predictable radio-to-radio isolation is maintained at all times - irrespective of individual radio's TX or RX operating mode or antenna isolation characteristics.