ATV
No sub-categories 10 Sites Boatanchors
Amplitude Modulation, Collins, Crystals, Drake, Eico, ... 171 Sites Digital
No sub-categories 8 Sites Directories
No sub-categories 32 Sites DXing
VHF 79 Sites Equipment
No sub-categories 11 Sites Events
No sub-categories 10 Sites Homebrew
No sub-categories 75 Sites Licensing
No sub-categories 13 Sites Morse Code
Bugs, Keys, and Coders, Software, ... 58 Sites Nets
No sub-categories 23 Sites News and Media
No sub-categories 15 Sites Organizations
Clubs, Emergency Communications, National Societies, ... 620 Sites

Packet Radio
No sub-categories 17 Sites Personal Pages
Australia, Belgium, Canada, France, Germany, India, ... 337 Sites QRP
Clubs, Stations 37 Sites Radio Direction Finding
Groups 13 Sites Regional
United States 3 Sites Repairs
No sub-categories 5 Sites Satellite Tracking
No sub-categories 9 Sites Software
Directories 105 Sites SSTV
No sub-categories 6 Sites Swap Shop
No sub-categories 5 Sites VHF
50 MHZ, Internet Linking, Meteorscatter, Moonbounce, ... 80 Sites VoIP
No sub-categories 13 Sites

Two-Way Radio
Business : Telecommunications 496 Sites Shortwave and DX Listening
Recreation : Radio 115 Sites

Radio Astronomy
Science : Astronomy : Amateur 13 Sites Sun
Astronomy : Amateur : Solar System Observing 5 Sites