Junkyard is the first place I'd look.
Secondarily, he can use a negative-ground radio if it's carefully isolated
from the car's frame and the electrical connections made appropriately.
Also, the radio antenna coax braid needs to be ground-isolated with some
small-value capacitors (or just isolated completely - that works fine on AM
and FM).
If you want to talk more on it see me off-line - don't want to bore folks.
ajr
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