We had the same issue with our 2007 Dodge Ram truck. We use an external antenna when we have the camper on. You can buy these at various places on line. Get the car antenna not the home antenna. It magnetically mounts onto the truck so we put it on our hood and routed the antenna wire through the passenger side door. Our satellite box is behind the glove box. Remove the glove box and look up in the cavity. We were able to just unplug the factory antenna and plug the external antenna in. It's easy to switch back too. Just be careful with the antenna wire because it's fragile and any little bit of damage makes it useless.
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