Answer by
NessieGirl (103)

From what I understand the formula for radio advertising is based on a 1,000 unit. It would also be calculated on how many people really are going to hear the commercial. It is sold by the :30 or :60 spot. The units are called impressions so 1,000 impressions x spot.

actually the impression is 1 per 1,000. your calculation would be the cost of the :30 min (let's say $10) x the unit. Example: $10 x 4 impressions = $40) add a comment