Comment inSSIDer is what your looking for (Score 0) 499
inSSIDer will scan the freq's just like netstumbler but works with your existing wifi driver and stack. it will work with and card on XP, VIsta, or 7. as for netstumbler you don't mention your OS it only works on XP.
Second, the FCC will investigate if you phrase your complaint properly. use the terms Pirate Broadcast, and or terrorist transmission. don't expect them to solve it overnight it may take a few days or weeks for them to even show up.
Third, consider switching to 802.11n 5Ghz if the issue is specific to the 2.4Ghz range then using 5Ghz will evade the problem.