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A channel sounder for wideband car-to-car 2 x 2 multiple input multiple output (MIMO) radio channel measurements at 5.7 GHz with a bandwidth of 1 GHz has been developed. With the use of highly accurate synchronization units a high degree of coherence was achieved. The HHI-channel-sounder has been used in a measurement campaign in typical urban traffic scenarios in Berlin, Germany. This paper presents the basic operating concept of the system, followed by first results from the campaign.