GRP, Fiberglass , is invisible to most AM or FM radio signals.
Metal is not , our last coach was all aluminum and SS , a bus conversion and the antenna HAD to be external.
For a GRP vehicle a short small wire will do OK in a city , but on the road is useless.
Our solution was a visit to the big truck store.
For about $25 they have SS external antennas that use 2 stand offs , one doubles as the ant lead, which is included.
Extender the antenna is probably 4-5 ft long but it does the job.
The standoffs can be slid before any holes are created to fit wherever you will be mounting the ant..
I hate drilling holes in a big buck RV , but AM radio is worth the effort.
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