My 2013 378 has the round disc on top of a mounting bracket that you are discribing. The round disc snaps on by pushing it down on the mounting bracket.
I had to remove mine and resolder all of the wire connections inside the disc to make it pick up channels. There is no control handle on the ceiling inside the coach.
I would suspect your disc was not securely attached to the mounting bracket. They do not come off easily but do when you pull up with a quick upward jerk.
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2013 Georgetown XL 378
2008 Honda CR-V
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