If it's one of those doorway-like metal detectors there's no place to hide.
I have the Sony PCM-M10 and it looks like a camera/phone/whatever. At places like Madison Square Garden I just dump it in the bowl along with small mics, IEM earbuds, keys, phone, wallet, a bunch of metallic junk and wires all jumbled together, and they just don't care.
If it's wands, well, there's the crotch method....but in the YouTube era I really don't think things are that rigorous.