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The scattering analysis of distorting objects is an integral part of the discussed system simulations for navigation, landing and radar systems. The modeling of the antennas, the environment, the distorting objects and of the system itself are important steps of the system simulation process. The selection and adapted application of the suitable numerical method for the developed models are important assumptions for useful simulation results. Two scattering cases are described and evaluated by numerical results, namely the widest body aircraft A380 with regard to the ILS Instrument landing system and the wind turbines with regard to the C-band radar. It has been shown that the simple models for the A380 fail for the grazing angle incidence even if the best available numerical methods are used. These models do not describe the physical features of the aircraft or the tail fin correctly. By that the modeling and the applied numerical methods are a critical issue for approximate models for complex objects having in mind all the possible and relevant geometrical scenarios. It has been shown also that the calculation of the field distortions by scattering at the wind turbines cannot be interpreted by two fixed points in space, namely a distant source and a radar location.