First, take the bunkhouse TV to the front bedroom and confirm it's working okay. If not, the TV is at fault or not set up. Also check to see if the co-ax from the wall plate to TV is okay.
Then, with the bunkhouse TV back in (if working fine) remove the wall/ceiling plate that has the co-ax, 12VDC outlet and amp. pushbutton on it. It has an antenna "in" connection and two "out" connections. Flip the two out connections and see if you get reception in the bunkhouse. If you do, it's the wall plate. If you don't, it's definitely something to do with the co-ax cable and/or connectors.
Providing TVs are okay, the first suspect cause is usually a bad connection at a co-ax connector The center copper wire needs to protrude about 1/8" and the mesh-looking shield needs to fold back onto the outer jacket before the connector is installed as in the photo as in the 1st photo (showing a crimp connector). A crimp style connector is better than the screw-on style but needs a crimp tool. There is a proper tool for stripping co-ax but who knows if the guy at the factory used one and stripped the co-ax correctly. They are notorious for doing poor electrical wiring.