old Powerbook no longer connects to wifi; can't browse web
I've got a Mac Powerbook, circa 2002, running OS 10.6.8, that still works fine in terms of opening and operating the software loaded onto it. The only trouble I'm having with this old Apple laptop is that when I am on the go with it and try to connect with any server to browse the web via wifi, I cannot get the computer to connect with the wifi. I can get online using an ethernet wire connection. But no matter who's wifi router, I can't seem to connect anywhere via my Airport wifi internal circuitry.
Is my inability to get online a function of internet protocols that my OS 10.6.8 no longer supports? Or is this an "antiquated hardware" issue? Finally, is there a repair or item I can purchase to restore the connectivity of my laptop? This laptop has served me wonderfully over the years, and I would very much like to keep it running as my travel Mac.
Thanks for any advice you might provide on this matter!
Frank G.
Brooklyn, NY
Powerbook G4 (2002), Mac OS X (10.3.9)