Apps similar to PassMark WirelessMon include Xirrus Wi-Fi Inspector, which is free. Other options are WirelessNetView and WirelessNetConsole. In total there are three apps like PassMark WirelessMon for Windows.
The Xirrus Wi-Fi Inspector is a powerful tool for managing and troubleshooting the Wi-Fi on a Windows XP SP2 or later, Vista, or 7 laptop. Built in tests enable you to characterize the integrity and performance of your Wi-Fi connection. Applications include:
United States
Small utility that runs in the background, and monitor the activity of wireless networks around you.
Israel
WirelessNetConsole is a small console application that dumps all current detected wireless networks information into the standard output. For each wireless network, the following information is displayed: SSID, Signal Quality in %, PHY types, RSSI, MAC Address, Channel...
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