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Wireless sensor networks (WSNs) are highly susceptible to jamming attacks due to their resource limitations. In WSN architecture, the Base Station (BS) is a single point of failure, because it collects sensor readings and performs command and control tasks. So BSs are main targets of the jamming attack. For mitigating the effects of BS jamming attacks, we propose a hybrid model of defense, which combines 3 defense techniques. The first technique is BS replication, so in a jamming condition, there may be some unjammed replicated BSs for providing service to the network. The second technique is the evasion of BS from jammed location to any unjammed location. The third technique is multipath routing for providing alternative paths for communication with BS in case of jamming of one or more paths. Through simulation, we show the effects of the hybrid model of defense on the communication traffic throughput of WSNs.