After unsuccessful attempts to get my iwi0 wireless to work with dstumbler, I downloaded and installed kismet.
After installation, I vi /usr/kismet/kismet.conf and add this line to the "source" section:
then in term, running "kismet" displays the scan using the iwi0 device. Great! At last!. I'll find something about the dstumbler issue later. I haven't tested the wireless connection as there's no AP that I can test on. Something on that later when I have the opportunity.