IBook G4 14`inch - poor airportsignal

Hi there,
is there anyone who can tell uns why the airport signal for the iBook G4 is so weak and how it could be possible to get a better signal? We red a lot about in different discussions that it could be the ancle of the screen, the antenas, the thickness of the new iBook G4, etc.. But there was no proper answer to solve the problem.
We are using different MacBook Pro, Powerbook G4 and iBook G3 where the airport signal is much better.
Thanks in advance for your support.
axban

Compare the antenna wire installation with the photos in KB 108039, Properly attaching the antenna on an AirPort Extreme Card.

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