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There are two main types of antennas used in the wireless industry. Chapter 5 of Wireless Crash Course, Second Edition by Paul Bedell describes omnidirectional and directional antennas. (Reproduced from the book Wireless Crash Course, Second Edition, ISBN 007145280X, Copyright 2005, The McGraw-Hill Companies. Reproduced by permission of McGraw-Hill Professional, Two Penn Plaza, New York, NY 10121. Written permission from McGraw-Hill is required for all other uses. Click here for a detailed description and to learn how to purchase this title.)