Refractive multi path fading is recognized as the dominant mechanism of system degradation on MLOS (Microwave Line Of Sight) links. Therefore the objectives of the proposed propagation study in this paper are to obtain quantitative estimates describing the possible propagation mechanisms through a tropospheric region, and to predict the performance of proposed MLOS links in that region. Various measurements on temperature, relative humidity, and pressure are recorded for a humid region (Homs), and supplied by meteorological department in Syria. The data is based on daily measurements ranging from 3 to 8 readings with a collection period of 3 years (1994,95,96). Knowing the meteorological conditions, the profile of refractivity is first determined in that region. The mathematical model of the propagation channel is then generated to calculate the multi path parameters. Different link parameters and configurations are also proposed , and the performance of each is analyzed. Consequently, the optimum link parameters and configuration are recommended.