Regrettably, most of our on-air announcers delude themselves that they are professionals. They were made to believe that is so, by some sychophantic listeners. Moreover, these announcers prove unreceptive, from the BBC to all the vibrant American TV networks which are on display 24 hours every day, all splendid examples of superb broadcasting. Clinically, they prove a waste, failing to impact positively on our announcers as the same mistakes seem to escalate, repeating themselves with embarrassing frequency. The general perception is that people learn from other people who are better equipped in some areas than they are.
Writers read other writers.
There is always some innovative or novel technique to learn and that would heighten one's individual performance. This is the same principle anent broadcasting. We listen to excellent enunciation, articulation, phrasing and the technique of breathing that enable us to read in group concepts. The pitch or level is identified and the skilled announcer exploits it with ease. He commands words with melody of the voice from a rapid but deliberate action of thought.