Your local antenna supplier will be able to assist you, but consider the following when choosing your POYNTING antenna:If you have a very poor signal in a rural area of far from a base station and you are able to mount the antenna outside, choose a directional antenna that operates in the correct frequencies.
If you work with more than one service provider and you are in an area that have better signal strength, such as in an urban area, then you should choose an omni-directional antenna. You should keep an eye on the antenna gain and its frequency to make sure you choose the correct antenna.
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