From what you have stated it looks like you have gotten OTA TV ok on all of your TVs. I would first check the coax connections on the back of the exterior hookup, make sure its tight. Then I would take off the wall plate that has the power booster on. Make sure that connection is tight. While your at it you might want to replace the splitter with a high quality one. Some thimes I have had to scan the TV in the ant. mode even for cable may want to check it out. I also have taken the coax cable from the camp pole directly to the TV this helped me narrow down the connection problem.
I have a 2017 ACE with the Siki TV and have no problem with cable.
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Retired and never looked back
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