I just read this article "Is there a place in America where people speak without accents?" which I found very interesting.
As the question about "speaking without an accent" is asked here very often, I thought I should share it with you
These two videos give some more tips about the ¨broadcaster accent.¨
https://www.youtube.com/watch?v=4NriDTxseog In the YouTube video, Fun Tour of American Accent, the narrator demonstrates that broadcasters vary their melody in more extreme ways than normal. (This portion starts at 4:15 if you do not enjoy listening to all her accents.)
In the pronunciation video ¨Julia Boorstin - Interview with a Broadcaster¨ http://rachelsenglish.com/julia-boorstin-interview-broadcaster/ Rachel from Rachel´s English discusses with her tips that she does as a broadcaster to pronounce things in a more clear, understandable way.