Currently Being ModeratedJun 22, 2011 8:22 PM (in response to Chris Shaddock)
You might try the following:
Open AirPort Utility - Click Manual Setup
Click the Wireless tab below the icons
Hold down the option key on your Mac while you click on the Radio Mode selection box
You'lll see 14 different combinations. The 5 GHz signal is on the left of the - (dash) and the 2.4 GHz choices are on the right. Choose the combo that is right for your needs and click Update to save your choice.
The Guest Network will track the Radio Mode of the main network. BTW, its a good idea to only enable the Guest Network when you have "guests" because the bandwidth is split between the main network and guest network when you run both.