CTE International
Manufacturer of terrestrial FM and TV transmitters, digital audio and video transmitters, microwave systems, UHF radio links, antennas and combiner filters. Based in Italy.
http://www.cte.it/

Radio Design Group, Inc.
Specializes in custom RF and wireless electronics design for data radio transmitters, receivers, and transceivers.
http://www.radiodesign.com

How Stuff Works: How Radio Works
Radio waves control everything from wireless networks to garage door openers. Find out how radio works and look at radio reviews and radio prices.
http://www.howstuffworks.com/radio.htm

JLC International
JLC International for humidity sensors, humidity transmitters, humidity calibrators, handheld humidity meters, hygrometers, dewpoint meters and dew point transmitters, gas and liquid turbine, Pelton Wheel, Oval Gear and ultrasonic flowmeters, air velocity transmitters and switches and other instrumentation for the industry
http://www.jlcinternational.com/

TDP
Guide to radio broadcast transmitters with links to and information about the manufacturers of AM, SW, FM and DAB radio broadcast transmitters and specification sheets of new and old shortwave radio broadcast transmitters.
http://www.transmitter.be/

Bsi Broadcast
BSI BROADCAST, FM Radio transmitter manufacturer, provides all solution for your broadcasting needs
http://www.broadcastbsi.com

Frogtronics
A nice selection of radio transmitters schematics and simple test gear
http://www.mariucci.freeserve.co.uk/

Patex
COFDM Digital Microwave is the solution. Patex (UK) Ltd specialises in Microwave Technology offering complete solutions to cabling for CCTV. cofdm transmitter. Microwave transmission and wireless technology. Patex supplies all your wireless transmission requirements. CCTV, mobile surveillance, covert units, military systems, rail/port security, remote surveillance etc. Our customers value our microwave transmission systems because they are simple to install and provide a reliable wireless video / audio link.
http://www.patex.co.uk

Elenos
Elenos propone una gamma di prodotti specializzati in grado di risolvere al meglio le problematiche del broadcasting
http://www.elenos.com/

Electronic Circuits for the Hobbyist
Electronics projects you can built, circuits, Kits, projects, electricity, schematics, High Voltage projects you can build. Radio Control and Electronics, 3500+ indexed R/C links database.
http://www.uoguelph.ca/~antoon/