Hello,
If you want your Huawei E5372 pocket wifi has better performance and more stabe, you can use below the antenna to improve the signal strength:
http://www.4gltemall.com/4g-antenna-two-ts-9-connector.html
http://www.4gltemall.com/media/catalog/product/cache/1/small_image/190x190/9df78eab33525d08d6e5fb8d27136e95/3/5/35dbi_4g_antenna_with_dual_ts-9_connector2.jpg