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The developed laboratory waveguide transmission negatively correlated with the moisture content. Figure 1 shows system for measuring the attenuation of microwaves by vegetation the microwave radiation intensity of different surfaces (metal, canopies is discussed. Some results obtained for the attenuation water, soil) with varying properties. effects by fragments of trees in the frequency band 0.8 -10.0 GHz are presented. The waveguide transmission system and the measuring procedure provide the acquiring of continuous attenuation spectra in a wide frequency band under controlled vegetation parameters. The propagation characteristics of the o electromagnetic waves in the ultra-wide band waveguide transmission system are similar to the propagation characteristics I in the free space. This makes possible to use the laboratory results in practice. ____t

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