A measurement campaign was developed for determining the power attenuation due to individual plants placed inside an anechoic chamber. Measurements of copolar and crosspolar components were conducted to study the depolarization of the incident wave produced by propagation through trees. An analysis of signal strength and depolarization in long- and short-terms, due to wind incidence on individual trees, is presented. Cumulative distribution functions (CDF) for the slow fading component, were obtained, and correlation coefficients were estimated, between the copolar and the crosspolar power levels measured for the different wind speeds and fan positions, to analyze the influence of the wind speed on the depolarization. (6 pages)