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HDTV Primer compared consumer television antennas using NEC-based computer models, publishing raw-gain and net-gain graphs across VHF and UHF instead of repeating manufacturer claims.
W8JI.com is a dense amateur-radio engineering archive covering antennas, amplifiers, baluns, tubes, transmission lines, common-mode current, receiver problems, RF measurements, grounding, noise, and the myths that grow around all of them.
Steve Yates's AA5TB site has been online since 1998, collecting practical amateur-radio notes on antennas, feed lines, QRP work, homebrew baluns, small transmitting loops, and other material built from decades of hands-on radio experience.
Antenna-Theory.com turns topics such as VSWR, baluns, radiation patterns, Smith charts and Maxwell's equations into a large practical tutorial written by an experienced antenna engineer.