When I was in college I owned a modified Timberline that had the fiberglass hoop over the middle, but it also had fiberglass poles on each side going from corner to corner - then the middle hoop attached to the center of each of the side hoops.

It might have been called the Aurora? It was the best!!

About 10 years ago the fly got very sticky and it became unusable. I called Eureka and they said the coating had degraded and there wasn't really anything I could do. It almost hurt to finally throw it out.