The King Jack antenna control box includes a switch, a splitter and two coax outputs.
One coax output is on the face of panel the to connect to TV1. The second coax output is not visible, but can be wired to a second location in the trailer.
The switch selects between the antenna and the external coax input to the trailer, and drives both TV outputs with the same signal.
The follow is from the King Jack owner's manual, which can be found here:
https://kingconnect.com/wp-content/u...Compressed.pdf