Invisible wrote:
> Well, since it's impossible to know how many people are listening at any 
> given instant in time,

It's possible to get close.

And I believe it's actually charged on the number of people in range of the 
station. I.e., based on population densities and antenna power.

-- 
Darren New, San Diego CA, USA (PST)
  "How did he die?"   "He got shot in the hand."
     "That was fatal?"
          "He was holding a live grenade at the time."

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