If the radio waves run along the surface of the earth (so-called ground waves), their range is restricted and is determined by the topography of the earth’s surface, the degree to which it is built up and the amount of vegetation.
Si les ondes radio émises suivent la courbe de la surface terrestre (les ondes de sol), leur portée est limitée et dépend de la nature du sol, des constructions et de la végétation.
