The figure 6 below shows the graph of Receive Signal Level (RSL) in dBm over a
distance from the Base Station in the campus. As we can see, the RSL decreasing
from -66dBm to -94dBm when the distance increasing starting from 23m to 520m
but after this point, the RSL increasing from -94dBm to -86dBm. This is because after
this point, it is less obstruction and have line of sight.