If your netbook is using Atheros Wifi then you have to use ath_hal from current.
Checkout ath_hal from head,
svn checkout svn://svn.freebsd.org/base/head/sys/contrib/dev/ath/
and copy the ath-directory to /usr/src/sys/contrib/dev - you have to rebuild the kernel only.
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use UNIX or die :-)
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