wireless signal strength

[norman]

> Is there a tool to quantify the strength of the wireless signal of my home 
> network at different places in house?
> 
> The visual info in the guidance tray icon doesn't seem to change even if I 
> move the laptop right next to the router.

When I point to the wireless connection icon it gives the signal
strength. This changes when I take my computer into another room. 

Norman