Once you have chosen your stations and formats, you need to test and optimize your radio ads. You can use different methods to test your radio ads, such as surveys, focus groups, or split tests. You can also use tools like Nielsen Audio or Radio Advertising Bureau to get data and insights on your radio ad performance. You want to test different variables, such as your ad copy, voice, music, sound effects, call to action, and timing, and see how they affect your KPIs. You also want to optimize your radio ad frequency, which is the number of times your ad is played in a given period. You want to find the optimal frequency that maximizes your reach and impact, without causing fatigue or annoyance among your listeners.