In this paper a generalized closed form expression for the average detection probability of an energy detector is derived in terms of computable Meijer G-function. Where the reporting channel in the centralized cooperative spectrum sensing is experiencing a κ - μ shadowed fading. Each secondary user and the fusion center is equipped with multiple antenna for reporting. The arrived analytical expression provides the all possible conventional fading parameters also it is generalized for multiple antenna scenario. In addition, the improvement in detection probability is assessed when cooperative multiple antenna is deployed for reporting. The arrived expression is validated by analytical results over different κ - μ values with various multiple antenna scenario. © 2015 IEEE.