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document updated 15 years ago, on Mar 5, 2009
Why are USB wifi cards better than other ones? (desktop: PCI,       laptop-external: PCMCIA, ExpressCard,       laptop-internal: miniPCI, miniPCI-E)

Primary reasons

Allows you to buy only one good card

Easier to get an external antenna connector

Easiest to extend

Smaller reasons

Ad-hoc antennas Easy portability