[Lowfer] 8820 Hz question - maybe OT

[N8OOU]

Guys, I have been trying to remember my electronics and physics theory, 
and can't bring an answer to this question back to the top.  I don't 
know if it is off topic for the list, if so I apologize, and welcome 
direct replies.

My question is; what are the conditions or parameters for a signal like 
8820 Hz to change from being contained in the magnetism of a transformer 
or speaker voice coil to being radiated from an antenna?

I'm thinking I remember it being said that at some magic frequency above 
the audio range a signal starts to radiate.  Obviously that conclusion 
is not true. I spent some time on google last night and didn't find an 
answer.
-- 
73   de   N8OOU - Mike Meek