You can also use the following link to go to the article on "How to Orientate a Directional LTE Antenna During Installation". This will help with the setup of the directional XPOL-6 antenna from Poynting to achieve the best possible results.
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The slow internet reception you are currently experiencing could be caused by the placement of your router and your surroundings. The incoming signal from the cell tower is attenuated by the surrounding buildings and urban layout, which can causes a very signal to reach the router...