AirPort Utility 5.3.2 available for Leopard
www.tuaw.com/2008/06/11/airport-utility-5-3-2-available-for-leopard
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Apple has released AirPort Utility 5.3.2 for Leopard. According to the release notes, the package includes AirPort Base Station Update 2008-002, and applies general fixes and compatibility updates for AirPort Utility and AirPort Base Station Agent.