The key piece of technology invented by Alfred J. Gross that made his citizens' band (CB) radio possible was his radio-tuning apparatus, which he patented in 1950. Gross's radio tuner was much more efficient than earlier tuners because it compensated for the tighter frequency bands available to CB radios. Earlier radios required a separate tuning device attached to the radio receiver-transmitter. Because the tuning device was not an integral part of the radio, the mechanism was often unreliable and incapable of adapting if the transmission pattern changed. If an outside influence affected the incoming or outgoing transmission, the operator had to constantly adjust the tuner while trying to relay or receive the message. A change in either the broadcaster or receiver's location, for instance, meant that both parties had to retune their radios.

This made radio transmission difficult from a moving vehicle. Gross's tuner, on the other hand, was an integral part of the radio. His "loop tuner" used the incoming electrical impulse of the message to reset the tuner automatically. With this system, someone using a CB radio did not have to constantly tune the radio after he or she set the original frequency. This made the radio much easier to use, especially for operators who had no previous experience. It also made the radio more hands-free: An operator could use a CB radio with one hand, pushing a button to transmit and releasing the button to receive. This made the radio much safer to use in trucks and vehicles that required attention while operating.

The functionality of the automatic tuner made the CB radio a life-saving device. For operators who might be in danger, the CB radio was simple enough for a novice user or someone under duress to use easily. Conversely, rescue personnel could communicate through their CB radios in real time to those who needed their help, a simple act that facilitated emergency assistance. Moreover, because those who needed help and their rescuers were using the same frequency band, communications device, and open airwaves, everyone associated with an emergency call could speak to one another without an intermediary, in contrast to a telephone, which required a coordinating operator and which allowed only one person to speak at a time.

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