Fiberglass body vehicles (motorhomes) are notorious for having poor AM reception, as there is no ground plane for the AM signal to bounce off.
You may try grounding the antenna itself, but the improvement may be marginal.
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Don
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX
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