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In this paper, we discuss several large?scale fading models for different environments. The COST231?Hata model is adapted for air?to?ground modeling. We propose two criteria for air?to?ground channel modelling based on test data derived from field testing in Beijing. We develop a new propagation model that is more suitable for air?to?ground communication that pre?vious models. We focus on improving this propagation model using the field test data.