Hi Bert,
I use one of these
USB wireless adapters, not to enhance the built-in wireless, but to have wireless
at all on my pre-Airport PB. (I actually bought it on a trip to a little mountain town in Colorado a couple years back...
)
It works fine when I need it. Can't imagine that it would be better than what you have with Airport, though the adapter does live
outside the titanium encasing...