“…The pointed inhomogeneity of radio path is the cause of conversion of a normal wave of terrestrial wave guide at other normal waves. Having certain quantitative estimations about a significance of this effect on the base of our predecessor calculations for other types of inhomogeneity (such as an abrupt change of electric properties of ground, an abrupt one-step change of waveguide effective height) (Bahar & Wait, 1965;Osadchy & Remenets, 1979;Pappert & Ferguson, 1986;Pappert & Morfitt, 1972;Smith, 1977;Wait, 1968;Wait & Spies, 1968) we ignored the pointed effect in the publications (Remenets & Astafiev, 2015, 2016. Nevertheless, here we have to justify our previous neglect by taking into account the effect of conversion of a normal wave in other ones and to point for what type of URE precipitation (moderate, strong or powerful) it is necessary to take into account this effect while a boundary latitude calculation.…”