Considering the Unmanned Aerial Vehicles (UAV) application in communications, the maximum adaption of diversity combination properties has been used for some years facing the Bit Error Rate (BER) of selective combing, maximal ratio, equal gain, direct combining, selective, BER of Rayleigh, and Ricean approachRayleigh and Ricean schemes. This study avails a performance evaluation model to analyze the most common technologies in UAV diversity, combining Rayleigh and Ricean basedRayleigh and Ricean schemes on the diversity combination properties. However, a few models based on the Rayleigh and Ricean schemesRayleigh and Ricean schemes have been used for a while in analyzing the communication diversities at a smaller baseline. The existing proposed models have not currently depicted the most reliable and effective model of either adopting Rayleigh or Ricean in UAV communication systems. The study further presents a deep survey of the models and UAV-associated issues with a simplified mathematical expression offered by Rayleigh and Ricean to depict the comparison well. The simulated results demonstrated that the Rayleigh model performs better when subjected to the Ricean model considering the BER.