March 2026
Intermediate to advanced
400 pages
15h 45m
English
Content preview from WIRELESS & MOBILE DEVICE SECURITY Third Edition, 3rd Edition
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Wireless Antennas
Central to the performance of any wireless device is the antenna. Most access points, regardless of whether they were made for indoor or outdoor use, are manufactured with an internal antenna. External antennas are an option which can be used on access points that ship with an external antenna connector (many don’t). Regardless of whether the antenna is integrated or external, the antenna types function the same.
Antenna specifications include horizontal and vertical beamwidth, and gain. These patterns indicate the direction of signal radiation. Gain is an indicator of the effectiveness of the antenna to focus signal energy in one direction and is specified as decibels (dB), or decibels relative to an isotropic radiator (dBi). ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.