They should be. This is how it works.
The outlet at the booster is set one. Anything else is set two.
The antenna signal comes from the antenna and into the back of the antenna booster. The cable input signal also goes to the back of the booster. From there, it puts both signals to the outlet to set one and another outlet (on the back of the booster also) labeled set two. From there, it can just be split to as many tvs as they want.
Also, if you have cable and antenna signals, turning on the booster will override the cable signals and give only antenna.