Description: The influence of declination of phase front of an electromagnetic wave, emitted transmitter of a two-point coherent parasite, on an error of a bearing of the director of a parasite is parsed. Is shown, that the known theory of action on a suppressed radiodirection finder of a two-point coherent parasite explaining origin of an error of a bearing of the director of a parasite by distоrtion of phase front of an electromagnetic wave of a parasite, emitted in a direction of an antenna of a radiodirection finder, inadequately represents action of a two-point coherent parasite on a radiodirection finder.