17" 2.6Ghz Intel Core 2 Duo MacBook Pro, Poor Wireless Performance.

I have a (brand new refurb) 17" 2.6Ghz Intel Core 2 Duo MacBook Pro. The wireless drops down to null every minute. My old G4 Powerbook works better connection wise. Could there be a problem with the strength capability of the MacBook Pro?

This will fit:
http://store.apple.com/us/product/MA458LL/A/rechargeable-battery-17-inch-macbook -pro?fnode=5a
Ciao.

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