I've actually tested this at my local cricket field in a B5m and a Bmax4iii, 451 vs 481
Longest range was 451 with Ariel in traditional stand up antenna tube, range so good I could barely see car.
451 with antenna tube bent under shell is very similar to 481 range...not as far as above, but far enough that I don't think you'd worry on any proper track. HTH
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