Can I still use the older Airport Utility 5.5.3 if I install the 6.0 version of Airport Utility?
Mavericks has made some changes which means that AirPort Utility 5.x will not work. Specifically, /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Apple80211 has been updated and will break the older versions of AirPort Utility.



There are two ways to get around this:


Get an older version of Apple80211 and replace the one in Mavericks with it, then run the AirPort Utility binary through Terminal.
Use a modified version of AirPort Utility which includes the file in the app bundle.