I’m not familiar with WCF in particular, but a quick search seems to indicate you’ll want to manage that Bucket object as a Service reference in the app, which makes it a singleton. @matthew.groves or @jmorris or @MikeGoldsmith can probably fill this out in more detail.
We include a singleton helper as well for some of the .NET environments, and that’s covered in the documentation on managing connections. The ClusterHelper may apply as well in this case.