Well morning drive is the biggest time for radio, so expect to be paying the most.

The average rate is about $300, which is less than I would have thought but still an awful lot for :30.  That said, depending on what you're trying to advertise I would suggest checking out Google AdWords.  For $300 you can get A LOT more advertising and you only pay when someone clicks your ads!  To get an accurate estimate you need to call the individual stations, but I would recommend checking out alternatives because you will be able to get more bang for your buck.  But to answer you question, around $30.
Source(s):
http://www.gaebler.com/Cost-of-Radio-Advertising-In-Dallas---TX

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