If you are the one likes to enjoy the top 20 songs than 100% Top 20 is the good choice. The radio has a very well known history of being one of the popular radio broadcaster in France with lots of types of radio stations each dedicated to give their listeners a pretty different kind of feeling.
100% Top 20 official website address is www.radioscoop.com
If the Radio is extremely choppy and stops every 5 seconds, try listen to this Radio at different time.
Not all Radio Stations function for 24 hours everyday. If you can't listen to any Radio, try to listen at different time, as the Radio Station may stop during midnight according to its own country time zone.