It's tough I'll assume your roof is not metal. I carry a stainless rod about 3' long that I work into the ground it attaches to a ground lug fastened to the rear bumper. My mast is fastened to the ground lug also I use a screwdriver antenna with home made radials it's a wild setup but it works fastening the RV and mast to the ground rod made a big improvement. I have a camper with an aluminum roof that helps and I went to great pains with a megger to assure the roof,camper and radio all went to a single point ground.
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