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Wi-Spy DBx is a great tool for those looking to troubleshoot WLAN interference quickly, easily and inexpensively.
eWeek

"It's a very cool and useful product that any network engineer must have."
ZDNet

Wi-Spy 2.4x is outstanding....an excellent value. Highly recommended.
Network World

Paid for half of itself in an hour.
Wi-Spy Customer

"Wi-Spy is probably the cheapest and easiest to use of all budget wireless analyzers out there."
InformIT

Highly recommended! If you've got an enterprise installation of any size or you're in the business of planning, installing, managing, or troubleshooting WLAN systems, get one.
Network World

Wi-Spy 2.4x

Compare Models | Benefits 
Wi-Spy 2.4x

As the 2.4 GHz ISM Band becomes more congested interference from non-Wifi devices can seriously degrade Wi-Fi performance. Other Wi-Fi tools, such as NetStumbler and Kismet only provide information about other Wi-Fi devices, but do not show interference from cordless phones, microwaves, Bluetooth devices, Zigbee, and other 2.4 GHz devices. Wi-Spy shows you the radio signals on the 2.4GHz band from all devices transmitting in that frequency - regardless of whether they are Wi-Fi devices.

2.4x: $199.00 CDN!

    

2.4x Pro: $609.00 CDN!

    
Pro version includes license for Chanalyzer Pro.

The Wi-Spy 2.4x is a compact spectrum analyzer designed for IT professionals. It scans and displays radio activity in the 2.4 GHz spectrum. The Wi-Spy 2.4x helps to quickly identify interference, find the quietest channel, and analyze the quality of the signal. Save time and money by setting up your wireless network right the first time.


Chanalyzer 3.4

Benefits

Quickly identify interference
Find the quietest channel
Analyze the quality of your wireless signal
Resolve sporadic Wi-Fi issues
Monitor multiple Wi-Spys over TCP/IP network

Specifications

Antenna: External, RP-SMA
Bandwidth: 2400 to 2495 MHz
Frequency Resolution: 328 KHz
Amplitude Range: -110 dBm to -6.5 dBm
Amplitude Resolution: 0.5 dBm
Sweep Time: 165 millisecond

System Requirements

USB 1.1 or 2.0
Windows 2000, XP, or Vista with .Net 2.0
Mac OS 10.x with Chanlyzer Lite or EaKiu*
Linux/MacOS using Kismet Spectools*
1024 x 768 Screen Resolution or Greater

Looking for cheaper spectrum analysis?

The Wi-Spy 2.4i just might do the trick. Click here to compare.


More Information

Recon remote Wi-Spy tool
Chanalyzer 3.x
Wi-Spy 2.4x at Metageek
Wi-Spy Comparison

* No offical support by Futura GTS or MetaGeek