The ideal height of a mast radiator depends on transmission frequency formula_2, the geographical distribution of the listening audience, and terrain. An unsectionalized mast radiator is a monopole antenna, and its vertical radiation pattern, the amount of power it radiates at different elevation angles, is determined by its height formula_3 compared to the wavelength formula_4 of the radio waves, equal to the speed of light formula_5 divided by the frequency formula_2. The height of the mast is usually specified in fractions of the wavelength, or in ""electrical degrees""