The device that feeds both visual and aural TV transmitter signals to the antenna while not allowing either to be fed back into the other transmitter is called:

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Quizplus · Accepted Answer

A diplexer is a device that combines or splits signals, allowing for the simultaneous transmission of two different signals through one antenna while preventing the signals from interfering with each other. In the context of TV transmission, it allows both visual and aural signals to be fed to the antenna without being fed back into the other transmitter.

The Device That Feeds Both Visual and Aural TV Transmitter