As I recall, they were supposed to shut down in the late 90s or thereabouts, but then came back after a few years. I listened to what was supposed to have been their last broadcast then; it was quite a thrill. I even looked into visiting St. Helena, but at the time it would have taken at least a month and probably in excess of $10,000, since they did not have an airport and the only access was by ship.
Perhaps they will return again.