This slideshow was presented at AfNOG 2009 in cairo, Egypt.
It is a very brief introduction to antennas for WiFi, touching concepts like directivity and gain. It mentions radiation patterns and other properties of antennas as well. A few examples of typical antennas for WiFi are also given (omni, cantenna, parabolic dish).
The video is without sound, so you can add voice over as you please. Also, there is a lot of space for subtitling, The video is not meant for online use only or primarily. we encourage its distribution on cd or dvd.