American Radio Relay League web site.

Beginners Guide to Ham Radio

QRZ's Practice Amateur Radio Exams

Amateur Radio RF Safety Calculator

Amateur Radio A Little History and a Lot of Antennas, Antenna Modeling Software Notes, Practical Antenna Notes( vertical, horizondal, lower HF, Upper HF, UHF, VHF), Transmission Lines, Impedance Coupling, and Construction

APRS™ database and information

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