Where is "Use Interference Robustness"?

Hello,
i miss the function "Use Interference Robustness" in Mac OS X Leopard!
Without this i am losing constantly my Airport Connections.
Can anybody help?

Interference robustness has worked well for a number of people not using Apple Airport base stations (such as myself). As it turns out, I have an Airport Express that my iMac under Leopard will not recognize only 2 feet away. Naturally, under Tiger all is still well.
Moving interference robustness under the advanced settings is a real problem for people without Airport base stations as it is now impossible to get to the settings without recognizing a base station.
For example, I had turned on interference robustness during the two minute window that my Airport Express was recognized. Now, since Leopard is so spotty (sorry for the pun), I can't reliably test whether or not that setting helps at all. That said, I can report that my basic internet connection was practically nonexistent prior to implementing interference robustness on my iMac G4.
I'm surprised at Apple for this one - Leopard has been been through what seems like extensive testing, and this pops up! And no response from Apple ...
Steve

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