I do advertizing for a living, so quick skinny on radio.
cons- trouble reaching people under 30, because of I-pods, pandora, satelite radio, etc
limited reach, each radio station tends to have narrow demographic of listeners.
Only audio, no visual so if your product is visual is a tough sell
Often the listeners are engaged in other activities while listening.
Pros- good frequency
Targeted demographic
Best way to use radio- 3 stations, 20 ads per week on each station.
Best if you already have a strong brand in the marketplace.
most major brands are not built on radio, they do use radio as additional touch points. If you hear a Geico commercial on the radio your mind associates that with the visual image you have in your brain of the Geico lizard. If you hear a radio ad with no visual in memory to back it up, it is difficult to retain.