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The diversity effectiveness represents the signal improvement by means of an antenna diversity arrangement expressed by an equivalent fictitious number of n decorrelated antennas. With a low-cost compact 4antenna-arrangement on the backlite the diversity effectiveness is considerably higher than with a 2antenna-system with one antenna on each of the front and the back window. This is evaluated from antenna measurements and computer simulation of a Rayleigh field. Further antenna arrangements are discussed. Complex antenna systems of this kind for FM-TV-antenna diversity and AM radio require a device for selftesting of operating functions for OEM production and customer service as well.

The principle of inconspicuous active window antennas is highly suitable for mobile application. Antennas of this kind form a necessary basis for a multi antenna diversity system on a car. The presented mobile multi antenna scanning diversity system highly improves the broadcast reception. The FM diversity system is optimized by application of an extremely fast operating FM diversity processor being available as integrated circuit now and being sensitive to noise, multipath distortion, cochannel-, adjacent channel- and intermodulation interference. The experiences, a german car producer has made with these systems in the late years in series production, are very positive and encouraging for implementation of these systems in future car models. Even a TV diversity system operating independently for picture and sound using different criterions is now under test.