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.

Dual Satellite Antenna Diplexer with DC Pass High Performance UHF/VHF Dual Satellite Dish Diplexer Signal Combiner with Weather Boots

Digiwave Sat/Ant Diplexer (full housing type) has a variety of uses, but it's typically used with DISH Network and DirecTV Satellite Television sytems where only one cable run is available, to send satellite programming "back out" to other televisions in other rooms using the same cable.

Diplexers/Combiners for Satellite and Antenna Signals. Run a satellite and antenna signal through the same coax connection on a TV simultaneously. Covers 40 to 2150 MHz frequency ranges.

Digiwave Sat/Ant Diplexer (full housing type) has a variety of uses, but it's typically used with OffAir Network and DirecTV Satellite Television sytems where only one cable run is available, to send satellite programming "back out" to other televisions in other rooms using the same cable.

Heavy Duty Professional Grade 2 GHz TV-Satellite Diplexer / Combiner - UHF/VHF Diplexers are used to combine or separate different frequency signals. They allow for off-air and satellite signals to be run on the same feed line.