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This paper addresses the analytical evaluation of broadcast protocols in VANET. We focus on the most popular broadcast algorithm, which consists for the current emitter in selecting the furthest receiver as the next forwarder. We propose a general framework based on point process to evaluate this protocol. Our approach is based on the theory of point processes and Palm Calculus. The radio environment is modelled by a generic Frame Error Rate (FER) function. This function gives the probability of losing a frame with respect to the distance. We derive simple formulas for different quantities relative to the performance of the broadcast protocol: time to propagate the message, emitters' intensity, mean number of receptions of the same message, etc. These formulas hold for any FER function, enabling the comparison of broadcast performances under different radio propagation environment.