Communications
- 341
 - Far Circuits
 - A manufacturer of printed circuit boards. Boards are stocked for most of the ham projects published in popular magazines for the amateur radio community.
 
- 342
 - HamRadioFun
 - Radio kits, including a wide band active antenna, outdoor shortwave antennas, ham radio QRP transmitter, and an antenna tuner.
 
- 346
 - NHRC Repeater Controllers
 - Repeater controllers and related accessories for amateur and land-mobile radios. Order by mail or phone.
 
- 347
 - North Country Radio
 - Kits, including transmitters and receivers. Technical articles and information on electronic subjects geared towards ham radio, shortwave and video projects.
 
- 348
 - Powerwerx.com
 - Anderson powerpoles and OEM power connectors for amateur radio and other DC Hobbies. Also, batteries, RF adapters, bulk wire, red/black zip cord.
 
- 350
 - SHF Microwave Parts Company
 - Microwave and RF parts for datalinks, television, voice, and telemetry.
 
- 351
 - Sherwood Engineering Inc.
 - Kits, components, and custom IF filter enhancements for most communications receivers.
 
- 352
 - Sphere Research Test Equipment
 - New and used electronic test equipment, tubes, semiconductors, RF and microwave products, and sliderules.
 
- 353
 - Transel Corporation
 - Manufactures and sells communication equipment and spare parts. Includes online catalog, prices and shopping cart.
 
- 355
 - Scanner Master
 - Online dealer of police scanners specializing in Uniden Bearcat, GRE and RadioShack digital scanners, radios, software, programming, scanner frequencies and online police scanner systems.
 
- 356
 - Signal Intelligence
 - Radio monitoring and traffic analysis software for two-way, wireless, public safety, news media, spectrum management and government.
 
- 357
 - The Quack Shack
 - Offers Uniden scanners, CB Radios, 10 meter radios, and accessories. Also provides a forum for discussing mods for scanners, CB radios, and 10 meter radios.
 
