[deport]

I can think of 20 million reasons why you're wrong.

Can you explain the 20 million thing..... is that unique listeners in a hour, day, week, etc,?
Or is it total listeners in a week, many of which have tuned in each day... thus repeat counts

I've looked for rating numbers to see how they actually rate the listeners in radio but can't find anything. I think it is Arbitron that does the ratings...

[Pokey78]

I worked in radio for a number of years.

Those are Arbitron numbers, and anyone can take them and shape them any way they want.

When "the book" comes out, you'll hear every radio station in town declare "WE'RE #1!" And they will all be correct. It just depends on how you read the numbers.

[oldvike]

I'm not 100% sure. I heard Rush explain it once and got the impression that it represented the number of different people who had listened to the show within any given week. It doesn't mean they were all listening at one time, just that they all heard the program at some point during the week. Pretty confusing if you ask me.