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In a word, wireless site surveys are necessary because radio wave propagation is difficult to predict, especially in non-open space environments. Considering all the variables that might affect the health and performance of your WLAN is virtually impossible. Changing conditions, even something as seemingly minor as a notebook equipped with a legacy 802.11g adapter that your new employee connected to the office wireless network, might seriously impact the WLAN performance. In addition, considering the wide proliferation of wireless infrastructure, factors such as interference from nearby WLANs play a very important role. This is why regular site surveys conducted with a professional tool are essential.
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