My Columbus 320RS was built in March 2012.
If I turned on the LED lights over the TV or stove, the TV picture would go out when using the roof antenna.
Here's what I would recommend doing:
Remove the antenna amplifier plate located behind the TV.
Make sure the coax cables are all tightly screwed into the amplifier. Also, make sure the coax terminals are tight on the cable ends. Mine wasn't. It is now and my TV works great with the antenna.
Finally, make sure ALL the coax cables are connected to the amplifer. The cable running to my roof antenna was not connected AND the terminal end was loose.
2013 Palomino Columbus 320RS
2007 Dodge RAM 2500 6.7 Cummins
Reese 15K manual slider
M.I.L. in Florida for good!!