Presented in this paper is an empirical model for long-term rain attenuation prediction and statistical prediction of site diversity gain on slant path. The novelty of the model is the inclusion of low elevation angles and high link frequency up to 70GHz in the model derivation. The comparison results with Hodge, Panagopoulos and Nagaraja empirical predictions show that the proposed model provides better performance for site separation distance and elevation angle. The model performance is good.