From owner-freebsd-wireless@FreeBSD.ORG  Mon Oct  8 10:15:12 2012
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Date: Mon, 8 Oct 2012 12:15:11 +0200
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From: Sven Hazejager <sven@hazejager.nl>
To: freebsd-wireless@freebsd.org
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Subject: Spectrum analysis?
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Is there a way to do a spectrum analysis for the wifi band with ath on
CURRENT? I would like to understand which channels give me the best
signal/noise ratio (my baby monitor completely blows our wifi away)
above and beyond other 802.11 activities. Does not need to be fast.
Mikrotik has something like this; they use standard Wifi equipment to
analyze 20MHz at a time with 10MHz increments, creating a nice heat
map of the available spectrum...

Thanks!