Hello rdav - thanks for using the Slingbox Answers Forum!
Sorry to hear you're having trouble with the setup of your AirPort Extreme. Here are a few links to articles on our support website which might be helpful:
Two methods to set up a Slingbox with an Apple AirPort Express and connect it to your wireless network (even though this is meant for AirPort Express users, it still contains some valuable troubleshooting info)
If this doesn't help, please let us know. The more details and information you can provide, the better we (the forum community and Sling Media) can help.
The Slingbox Answers Forum Moderation Team