Before revision: If the field is obtained by three measurements in an orthogonal X, Y, Z configuration in the form: a sufficient condition for the expression to be true for every three orthogonal coordinates (X,Y,Z) is for the probe radiation pattern to be as close as possible to ideal short dipole pattern, called sin θ: , where A is function of frequency.
After revision: If the field is obtained by three measurements in an orthogonal X Y, Z configuration in the form: a sufficient condition for the expression to be true for every three orthogonal coordinates (X,Y,Z) is for the probe radiation pattern to be as close as possible to ideal short dipole pattern, called sin θ: , where A is function of frequency.