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Some ways of technical implementation of a high-power multiplexer for common operation of several broadcasting transmitters in the metric and decimetric waves band are considered. These transmitters pick up and carry a common aerial feeder that allows extending a net of TV and radio broadcasting by complete using opportunities of existing equipment. Engineering solutions proposed to build high-power multiplexers have been developed, designed, manufactured, tuned, tested in laboratory and under high-power operation mode. Some of those multiplexer are used now at TV and radio broadcasting centers in Ukraine since 1994.