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Re:OS X 10.10.3 seems to have done something bad to wifi dri... by threeseed on Sunday May 03, 2015 @12:55AM (#9479997)
No idea why they didn't put these in Utilities but:

/System/Library/CoreServices/Applications

There is an application there called Wireless Diagnostics.

Re:OS X 10.10.3 seems to have done something bad to wifi dri... by eridius on Sunday May 03, 2015 @04:01AM (#9480438)
Option-click the wifi menubar item. "Open Wireless Diagnostics…" is an option there.