Well, if we break it down, 'radar online' is likely an online entity, perhaps a news or media site. When it says 'no new stories', it implies that for the time being, readers won't find any freshly - written or newly - added stories on it. It could also suggest that their team of journalists or content creators haven't completed any new pieces lately.
Perhaps 'radar online' is a news source or something similar. 'No new stories' simply indicates that at the moment, there are no fresh articles or reports available. It might be due to various reasons, like a slow news day, technical issues preventing new uploads, or editorial decisions.