The rapid usage of wireless-communications in personal, commercial and governmental capacities, efficient spectrum utilization has become a prime topic of interest. Most of the licensed bands suffer from under-utilization and less spectral occupancy of spectrum. Cognitive radio technology promising solution to the problem of low spectral occupancy and inefficient utilization of the licensed radio spectrum. A prime constituent of the cognitive radio technology is spectrum sensing. Energy detection (ED) is one of the popular spectrum sensing technique for cognitive radio. In this work, I Proposed RTL 2832U SDR stick is suitable for energy detection based spectrum sensing method. In this experiment, we capture the real time signal coming from the BTS over the different city in rural & urban area using an RTL 2832U SDR stick to decide the frequency band available or not. The GNU Radio software allows for the implementation of Energy detection spectrum sensing technique using the RTL-SDR.