To calculate radio ad rates, take the SQAD cost-per-point (in US$) for market and multiply it by the Arbitron rating for the program that airs at the same time. That will equal the cost of the ad.
SQAD cost-per-point
x Arbitron rating
= (relative) radio ad cost
Note: UNC does not have access to the full data collected by Arbitron. This proprietary data is only available to Arbitron clients.
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