There is, indeed, a booster, there is just no button for it:
Quote:
A color-coded coax cable runs from the KeyTV box to each TV location with no splitters or jumpers to degrade the signal. Inside and outside connection points are clearly labeled. There’s no need for a “booster button” as KeyTV senses the signal source and automatically boosts the over-the-air signal.
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(This is from
a Keystone web page.)
The booster boosts signals arriving on specific ports, such as the rig antenna, and not on other specific ports, such as satellite or camp cable. To make this all work right, you have to make sure you don't have the wrong cable screwed into the wrong connector.