Looking for a freeware utility to track wifi uptime

[ChromeFoundry]

3. For a CSV output...

I will assume you are using Windows 7.

Define your properties and sample rate in the Performance Monitor window.
Right-Click Performance Monitor tree node. New -> Data Collector Set...
Name: "Bandwidth" -> Next
Root Dir: "C:\Users\username\Desktop\Bandwidth\" (or where ever) -> Next
Run As: <Default>, x - Start this data collector set now -> Finish

Find the "Bandwidth" node in the tree under "Data Collector Sets", "User Defined"
In the Right Panel, Find "System monitor Log"
Right-Click "System monitor Log" -> Properties
Log Format: Comma Separated
File Tab -> Log file name: "Bandwidth"
Log Mode: Append
Button: Apply -> Ok

Right-Click "Bandwidth" -> "Stop"
Right-Click "Bandwidth" -> "Start"

You will now be logging your available bandwidth for every second... May want to change it to every 15 seconds if you plan on keeping several days of data. The CSV file will contain a DateTimeStamp column and the Current Bandwidth of the adapter you selected. If you see 54Mbs, that means you are probably on an 802.11g network and you have fill signal. As the signal gets lower, you will see your current bandwidth drop... could get as low as 1.2M before it drops down to zero... meaning no signal.

Hope this helps.