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In this paper, we presented experimental data of the strength of the electro-magnetic waves in the engine room of automobiles. Measured frequency ranges are 145~380MHz and 844~1044MHz. Experimental studies are conducted by measuring the radiated power of the frequency spectrum for above frequency bands. The λ/2 dipoles used for measurement are fabricated to comply with the COMMISSION DIRECTIVE 95/54/EC. Experimental results confirm that the level of radiated power in the engine room at idling rpm is about 3dB higher than that of 1500rpm.