The radio system communication requirements in a nuclear plant include: communications with local law enforcement, company load dispatcher, company environs group, security and operating engineers. Each radio system is designed to provide the communications required. The internal communications is most difficult because of the hostile environment, i. e. , the plant is designed to prevent nuclear radiation from penetrating from one area to another, but the radio radiation is to penetrate the entire plant. The stationary radio equipment is to be concentrated in one secure area to protect it from sabotage.