This graph illustrates interference to radio astronomy from a satellite transmitter whose signal is so broad that it spills into the band of frequencies allocated to radio astronomy by international agreement. The radio astronomy band lies between the two vertical blue lines. The horizontal red line indicates the power level defined by the International Telecommunications Union (ITU) as detrimental to radio astronomy; any signal above the red line is above this detrimental level. Instead of being designed and built to eliminate signals outside of its authorized range, this transmitter spreads radio emissions over a very wide range of frequencies, far beyond its ITU-authorized range.