Propagation of extraneous signals by F- or E-region reflection in addition to the desired ionospheric scatter mode; the undesired signal enters the antenna through the back lobes.

1. Radar echoes from a target.

2. Undesired radiation of energy to the rear by a directional antenna.

The deflection of radiation or nuclear particles by scattering processes through angles greater than 90° with respect to the original direction of travel.