Antenna radome will significantly affect the antenna performance inside it. The radome dimension is usually mush larger than the fine structures of the antenna, therefore, the radome problem is electrically extremely large and complex problem. In this example, the radome dimension is 2000 times larger than the fine structure of the antenna, the computational domain is divided into 1200x1400x1300 non-uniform cells. It took 28 hours for GEMS HPCC system to simulate it for 50000 time steps.