If you pull the wall plate that has reset button (it's really the antennae power booster on/off) you will see several coax connectors. They come from the antennae and split off to various TV coonections. Mine were all loose or not properly twisted on i.e. the ground sheath wasn't making contact. I fixed all the loose ends and bingo channels! This was on my first trip after new pickup.
You can also test connections with a multimeter.
1. Turn amp button off
2. Take a scale piece of coax, twist ground sheath and center wire together
3. On the roof, disconnect the coax from the antennae and use a barrel connectors to attach the test scrap from step 2.
4. Use the multimeter at each outlet in the trailer. One probe on pin, one probe on sleeve. If it's a good connection the needle will move, if not there is a problem between TV and Antennae.
5. Check every outlet, then you may need to go behind the amp wall plate.
6. If outlets all pass. Check for bad cable to TV from its outlet.
7. If all cables are good. Try a different TV
LAST - DO NOT FORGET TO REMOVE THE TEST SCRAP AND HOOK ANTENNAE BACK UP.
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