We recommend a 5Ghz Network when using Show Pro. Dual Band is the best if you have the hardware for it. This will help keep Show Pro running smooth during a live event.
5Ghz networks are much broader in the frequency spectrum so they are wider and offer more channels for your network to choose from. 2.4Ghz Networks are very compact and very busy but have a longer range. A good analogy is that a 5Ghz network is like a large open field with just a few people roaming around where as a 2.4 Ghz network is like a busy city street corner with lots of people and very crowded.
The Apple Extreme can run both 2.4Ghz and 5Ghz simultaneously. 5Ghz would be the preferred band but if you need more distance then the 2.4Ghz will kick in. Dual Band gives you the best of both worlds.
When adding an Apple Express to extend your network you can create a fast, quite and very wide wireless network.