This 2.4 GHz spectrum analyzer sells for $99, about 40 times less than other analyzers. The Wi-Spy is used to troubleshoot wireless networks, scanning for interference. Its software visually displays many wave types and can store date in real-time for reference. It works as a USB key device, about the size of a small Flash drive.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.