During the last 10 years, the interest to have an internet connection at home has grown up. In urban areas with a high density of population has installed the optical ber, which provides internet acces to the users. Otherwise, the rural areas, with a low density of population, the optical ber is not implemented, so it's proposed Broadband Wireless access (BWA). The rural areas have high density of vegetation, not like the urban ones. So in the prediction for urban areas is not usual to include a vegetation model. This tesis studies if the vegetation is an important parameter to take into account in the path loss prediction. It's analized how to model the trees and a group of trees and the eects of this model into the propagation of the wave. Furthermore, the path loss is computed using a ray-based propagation prediction tool, where mechanisms of propagation are considered. The scattering from the trees is modelled using Foldy-Lax multiple scattering theory and the scattering from other elements as terrain, streets and the buildings are modelled using Lambert approach. In order to determine the propagation eects of vegetation and hence to improve the propagation prediction, this thesis compares the predictions with a measurement campaign conducted at Hetzwege, Germany, where a WiMAX system operating at 3.5 GHz provides broadband wireless access to the village.