Will USB 802.11n wireless card improve video streaming on older iBook?

On my older G4 iBook, I'm accessing the internet through the AirPort Time Capsule as my wireless router. The video on my MacBook Pro is stunning, the iBook is terrible, useless really. Would a USB 802.11n video card work better than the AirPort card in the computer?

Duane, I meant a USB wireless adapter. The general consensus is that it would improve at least marginally, but no one seems to know for sure. Simple enough to find out, just haven't gotten around to buying one yet. I'll just need to make sure I can return it if there is no improvement.

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