On 2.4Ghz radios the aerial length that is critical is only the 30ish mm of exposed wire at the end...that is the tuned length...based on some simple maths to do with 1/4 wavelength...the rest of the aerial could be any length essentially as it's shielded up to that point.
My brother (who works with electronics and has access to the right tools for stripping the wire nicely!) has done some testing with this and has cut a spektrum aerial wire right down...and re-stripped the end to the right length...worked perfectly!
Sounds to me like the impact the car had might have done some damage to the receiver itself maybe???
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