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FM is generally immune to the RFI that abuses AM broadcast signals
There's books about this subject. Special shielded distributor and ignition
wire shields, line filters, anti static powder for tires, etc
This is one reason auto manufacturers switched away from copper plug wires and moved to resistor plug wires (Ugh they are so flimsy) and resistor plugs.
You might get details at the ARRL website or get a link at
www.ac6v.com which is full of ham radio links and maybe find the mobile rfi
stuff you want.
Bill
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