A single point ground is the best, I use a ground lug bolted to the frame of the camper the power cord to the electrical box is probably a better ground then any thing short of an 8' ground rod the wire it's at least a #10. I went all over the camper with a mega ohm meter and made sure every thing was bonded together (aluminum siding and roof) and grounded all of that to the single point ground a long with the radio and tuner. I'm using a 706G and a lil tarheel bolted to the side of the frame work on the roof I run my feed line and control wire for the antenna through a compartment and up to the table inside.
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