you can listen to BBC or VOA both of them are fantastic

i recommend BBC radio, it's very useful

I always use this site http://learningenglish.voanews.com, it's not a radio but there are many podcasts and videos, it's easy to understand

This is a site, not a radio but it may prove to be helpful to you: http://www.sloweasyenglish.com It's not mine and I make no money from it. I ran across it.