Grappling hook peg

I have a 3 dongle and the signal is not good. It keeps dropping out. how do I increase the dongle reception? - how do you get good signal with a dongle

He is a regular 3 dongle and I am technophobe so clearly that English would be more useful! I am a half-mile from a good sign, and I would like suggestions as if it's a product I can get, or if you know a trick you can do to increase the signal or something!