WLAN mapping / analyzer

Is there any ability to log and export the wireless snooping data into a mapping software, so that I can visually layout the range and strength of my wifi networks?

I see “Hive” from Berkeley (bvsystems.com), but I think it requires you to own one of their yellowjacket analyzers.

I also see softwares at http://secwatch.org/wifidownload.php?cat=1 but none look like what I need.

I would like to know if I can use data from the MT frequency monitor or snooper to accomplish this. Has anyone done this or know of a good way to do this in the GNU community.

What tools do any of you use to troubleshoot WLAN range or interference problems?