Research into radio trailers

Radio trailers are a technique of advertising that is mightily hard to get right. It relies entirely on voice, which makes it hard to sell the film in the short time you have.

although this is a technique that is in decline, it's still highly effective and listened to, due to car radios and forced advertisements through things such as Spotify.

main techniques featured

• reviews from respected newspapers 
• dialogue from the film
• music
• powerful voice over
• information on actors and directors

the reviews from the newspapers are a good technique to use as it reinforces the idea that the film advertised is a good and worthwhile watching film, with professional opinion persuading people to go watch the film.  

dialogue from the film can help grip the audience into the film itself, for example if you use some sort of cliffhanger line it will persuade the audience to go watch the films to see what happens next. Using dramatic dialogue from the film, such as high energy arguments and generally loud voices also draws attention to the trailer.

the use of music is very effective as it entertains the audience and can make the trailer sound much more dramatic. the use of popular music can pull in younger audiences. Another thing they could do is incorporate the movies theme music into the trailer, for example the distinctive Indiana jones theme music, as this can enable audiences to instantaneously link the music to said film, which pulls interest into the trailer (of course this can only be used in certain cases, like film trilogies and sequels and such forth)

name dropping actors and directors into the trailer can also help to persuade people to go see the film, if you hear the names "Leonardo Di Caprio" or "Martin Scorsese" for example, the audience will pick up on these household names leading to more interest in the film, and an assumption the film is worthwhile watching.

a powerful voice over can grip the audience into listening due to the bold loudness of peoples voice, which are very encapsulating and the audience feels compelled to listen, for example brian blessed. This can also make the trailer sound more dramatic.