Average duration: 30 seconds to 3 minutes
Use of SFX: most use reverb, delay and compression to improve sound quality and overall effect they are trying to give
Use of extracts from the documentary: there is normally a lot of dialogue in the radio adverts to keep the listeners focused. The people that are talking would usually make sure that whatever is being advertised is done in detail and clear, because unlike seeing an ad the listeners can't picture it.
How music is used to target specific audience: Obviously on the radio there is a lot of music being played, sometimes constantly. To appeal to a specific audience they would have to put the ad on a radio station that is being listen to by their target audience. Radio stations would use POP for example, to entice a younger audience for a documentary about something that they know they would be interested in.
How language is used to target specific audience: On radio stations that language is practically conversational and informal, to interact with their audience rather than talk to them.
How VoiceOver is used: If a radio station is advertising the trailer to a movie, then a voiceover is usually used to illustrate what the music and special effects are about.
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