Thank you, Larry.
A follow-up Q:
The stock length of the Senn A-band (516-588MHz) whip, as measured from the body pack to the end of the steel wire is ~125mm.
From the limited amount of reading I've done on 1/4-wave whip length, using the equation 300/CenterFreq/4 results that the 1/4-wave length of the A-band's center frequency (537MHz) should be ~139.5mm.
I referenced Lectrosonic's whip cutting guide and they recommend a whip length of ~120.4mm for Block 21 (center freq 550.35MHz). However, using the (300/CenterFreq/4) equation, the resulting 1/4-wave length is ~136.27mm.
Any idea why the given/recommended whip lengths are shorter than what that equation gives? (I'm sure it has something to do with theory beyond my tiny brain!)
(And just because it's interesting, here's a pic of the Senn antenn stripped of insulation.)