Get 2 bells, and install them so that they overlap by a few inches.
Heck, with the poles being able to be split, the PVC solution would
probably be a very good solution. I like the system that I've got, and
would recommend it to anyone that has the squirrel type of problem.
Like I said though, raccoons are a whole 'nother problem. They are
just as smart (persistent) as squirrels if not more so.......
Good luck................
Andy