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Diplexers are devices that separate signals by frequency. A Diplexer is a 3 Port device: one Common and two Input/Output ports. One Input/Output port is the High Frequency connection while the other is the Low Frequency connection. Diplexers allow two different band radios to share a single antenna, or a single radio to use two different band antennas. Thus, diplexers are very useful in integrating communications electronics: for example, one can share a long coaxial cable run to receive VHF and UHF signals. With a single Diplexer, a VHF and an UHF antenna can be be connected through the diplexer to a common coaxial cable and wideband receiver capable of both VHF and UHF operation.