A site survey is always performed first. This is a physical survey of the customer's premises to locate the best possible places to install access points and ensure 100% wireless coverage and optimum performance. Before installing any wireless devices we perform a radio frequency (RF) test in order to better understand the behavior of radio waves within a facility. This is recommended because various obstacles such as doors, walls, elevator shafts and people might affect the radio frequency pattern, causing it to be irregular and unpredictable. Even if you are using omni-directional antennas, radio waves do not travel the same distance in all directions.
The RF test can also detect any radio interference that might come from other sources and could affect the performance of the wireless LAN negatively. The ultimate goal of the site survey and RF test is to help determine the number and placement of the access points.