low voltage current technology apparatus and instruments for use in communications and high frequency applications and in control and regulating applications for motor vehicles and mobile communications, namely, aerials for vehicles, antenna amplifiers, antenna diversity systems comprised of multi-antenna arrangements, antenna amplifiers and detection circuitry for comparing received signals, convertors, signal processors, oscillators, modulators, demodulators, coders, decoders, relays, rectifiers, transformers; remote control units for use with electric door openers, electric window openers, keyless entry and for standing heaters; equipment for recording, transmission and reproduction of sound, images and data, namely, radios and televisions, mobile phones, facsimile machines and receivers for global position systems; computer programs for measuring, testing and checking of process data, function and performance of aerials for vehicles, antenna amplifier circuits, antenna diversity circuits and remote control units, namely, noise factor and signal to noise ratio, signal level, matching and reflection, radiation characteristics and electromagnetic compatibility, and measuring the electromagnetic field surrounding electronic instruments, electric circuits and antennas