is there any command line or gui tool to measure signal strength of wireless

Question

I want to know if there exists any command line option or GUI tool (Ubuntu 11.10) so that I can measure the strength of wireless signal at a given location.I have a house where the wireless is not easily accessible at all corners I want to know at which corners or rooms the signal is weak.This will help me a lot. Thanks in advance.

Answer 1

On the command line you can use iwconfig and look for "Link Quality" and "Signal level" values.

When walking around with a netbook I often use this command which updates the output of iwconfig every second:

watch -n1 iwconfig

Answer 2

wavemon -- Console app with color display and lots of easy to read information.

Answer 3

Here is a nice little tool i used for setting up my home wifi,

its java based and opens in a web browser

Meraki WIFI Stumbler

takes time but loads