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The propagation of radio waves in VHF/UHF is similar to the one of the light and is carried out at sight and in straight line. However, the transmission could be realized without been in this ideal case, by using particular propagation modes : Reflection, Diffraction, Broadcasting, etc.. But in these cases, tha propagation attenuations become quickly very important and it is proper to take into account during a feasibility study. Efficient models allows to define the main parameters : transmission power, reception sensitivity, type of antenna, antenna location, etc.. Whatever is the distance to cover, it is imperative to know well the profile of the field for defining the characteristics of the material to use.
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