Derrick Services Ltd – Oil Rig Construction & Offshore Construction Specialists
Derrick Services Ltd specialise in Derricks, Masts, Substructure design, engineering & project management, manufacturing & fabrication, offshore/site construction services, inspection & more.
http://www.derricksl.com

Directional Antenna System
Expert antenna system design and radio broadcast consultants located in Tennessee.
http://www.kintronic.com/services/technical-support/rf-feeder-design/directional-antenna-pattern/

Electronics and radio Today
Information, articles and projects for those who are interested in or studying radio and electronics
http://www.electronics-radio.com

NVLAP Accredited Laboratory
Rhein Tech Laboratories, Inc was founded in 1988 as a full-service design and compliance engineering test laboratory.
http://www.rheintech.com

Pre-Deployment Testing - Phoenix Datacom
Testing and analysis of network performance and security.
http://www.phoenixdatacom.com

Radio-Electronics.Com
Free resource of information, tutorials and articles about all aspects of radio and electronics.
http://www.radio-electronics.com