I'm assuming that you've already found the cable splitter, but in case you haven't - I have a 2016 29.3 and the cable splitter is located behind the wall in the cabinet right behind the antenna booster switch. There are four screws and the panel is a little difficult to take off. I bought my unit used about 2 months ago and have been looking for the cable splitter, I finally just started running down wires and taking panels off until I found it.
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