[lxgr]

Technically nothing, but legally it's just not allowed in the US (neither for FRS/GMRS, nor for ham radio operators, with very few exceptions).

[stackedinserter]

Interesting, is speaking in a language that nobody else understands counts as "encrypted transmission"?

[blackeyeblitzar]

That’s what I mean. Isn’t any data the same as speech in general?

[a96]

The phrase "criminal intent" comes to mind. No idea if anyone actually cares whether a signal is clearly understandable or not unless you're targeted for some reason.