We have studied the electromagnetic wave scattering at second harmonics from the system of two scatterers (dipoles or loop) containing a nonlinear local load in the form of a semiconductor diode. The scatterers were placed in a free space. We have considered the following geometrical configuration of the scatterers: dipoles disposed in mutually orthogonal planes, parallel dipoles, parallel scatterers (loops or dipoles) in the case when only one of them has a diode. In all cases the main attention is paid to study the behavior of the backscattering field at the double frequency on the distance between half-wave scatterers and location of the load in them.