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Thomas H. White's United States Early Radio History site has been online since 1996, collecting original research and period material about radio, telegraphy, broadcasting, regulation, callsigns, and the strange years when wireless communication was still being invented.
Noji's ham-radio section is a sprawling personal reference site covering licensing, equipment, repeaters, frequencies, nets, contesting, training, education, and the practical questions new amateur-radio operators actually ask.
Geoff Fors's WB6NVH site preserves detailed histories of California Highway Patrol radios, Bell System car telephones, Motorola and GE land-mobile equipment, forestry radios, obscure portable sets, wiring information, and restoration references.
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.
K3PGP's Experimenter's Corner is a sprawling ham-radio and electronics workshop covering weak-signal radio, lasers, moonbounce, astronomy, homebrew hardware, software, and experiments that range from VLF to visible light.
Radio Boulevard's RTTY archive documents mechanical teleprinters, terminal units, amateur-radio stations, and the hardware history behind radioteletype before computers reduced it to another software mode.
The national RACES site, established in 1997, documents the amateur-radio volunteers, rules, training, and emergency communications systems meant to keep messages moving when ordinary infrastructure fails.
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.
Giangrandi's personal engineering site has been online since 2002, collecting electronics projects, radio work, optics, mechanics, calculators, measurement techniques, and practical explanations in durable hand-built pages.
Christoph Berg's DF7CB site mixes amateur-radio logs, QSL cards, schematics and personal history in the durable style of a technically minded personal homepage.