My 2.4Ghz aerials are just wrapped around things inside the car, the receiver itself being a good one! Mine aren't even in vertical tubes, and are not protruding outside the shell.
Ran the last 2 years indoors and outdoors (including nationals) like that with no issues...and def wouldn't trim them short! Just hide them inside, but try and keep the last inch visible so it's not buried amonst things.
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