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The Wireless Sensor Networks (WSNs) have a wide range of applications such as target detection and tracking, environmental monitoring, and tactical systems. However, lower sensing ranges result in dense networks, which brings the necessity to achieve an efficient medium access protocol subject to power constraints. Various MAC protocols with different objectives were proposed for wireless sensor networks. In this paper, we evaluate the performance of WSNs using Two Ray Ground and Shadowing radio models and AODV protocol considering TDMA and CSMA MAC protocols. We consider Good put and delay metrics to evaluate the performance of WSNs. The simulation results show that for Two Ray Ground radio model, the good put of CSMA is better than TDMA. However, the good put of TDMA is better than CSMA when using Shadowing radio model.