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I found this whitepaper useful during my CWNA studies:

http://www.cisco.com/en/US/products/hw/wireless/ps469/products_data_sheet09186a008008883b.html

It has some nice introductory text about antenna theory, frequencies etc and follows up with a detailed review of all cisco antenna types. Best of all, it has clear photographs of each antenna type plus corresponding azimuth/elevation charts.


enjoy.

This is great. Also downloadable in pdf format.