In this study, the field strength variability (FSV) at Ultra High Frequency (UHF) and the maximum angle of incidence was estimated using the measured monthly climatic data obtained from the National Aeronautic and Space Administration (NASA) during the period of forty-two (42) years (1981 to 2022). The two climatic zones considered in this study are the Guinea Savannah and Coastal regions with two locations in each; Makurdi and Ibadan in the Guinea Savannah; Ogoja, and Warri in the coastal region. The findings indicated that for the four locations, the maximum average values of FSV at UHF obtained were 1.2459dB,1.2015dB, 1.2878dB and 1.4249dB, which occurred in the rainy season, the positive values observed indicate a strong signal with good reception quality while the maximum average values of angle of incidence measured were 0.6461º, 0.5334º, 0.6172º, and 0.4824ºfor Makurdi, Ibadan, Ogoja, and Warri respectively. The average maximum angle of incidence were found to be 0.5177º, 0.4126º, 0.4652º and 0.4013º for the locations during the studied period in which Makurdi and Ogoja values fall within the range of values (0.5º - 1º).