From the beginning - to use the terrestrial antenna in the coach the antenna power switch must be in and the green LED light on the switch plate ON. If you are using a cable connection, the antenna power switch should be OFF On the antenna switch plate there is a male coax connector. If you have an external antenna handy you can connect it there and with the antenna power switch off, see if any on the TVs can pick up signals. All 3 TVs should get the same channels. If you still have a problem the the splitter is not working properly. Pull it out of the interior passage and tighten the connectors. If it still doesn't work properly, try your portable antenna on any TV and see if a channel search works. I am trying to give you a systemic way to find where you are loosing the connection. It seems the antenna is not supplying any signals to any TV via the coax.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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