My home base has a STAR that leads to a point where your expected radar vectors. If ATC said the radar is down, I would expect them to say direct to the VOR/ NDB for a procedural approach.
If I'm VMC then I would just go visual! If you diverted to another airport you will be in the base captains office for a few words. Remember the instrument airports we fly to are catered for GPS/non GPS aircraft so basic B-RNAV will be available
