In a method for the remote controlled substitution, in particular of a defined advertising spot by a test advertising spot for selected receivers, it has been provided that bi-phase modulated start codes are transmitted in the picture lines outside of the TV picture visible on the video screen for the control of the address-distributed TV signals for the program part to be substituted. To execute this method, a household terminal in the form of an interposed device for commercially available TV
receivers has been provided, which is distinguished by at least two tuners, the outputs of which are connected with a fade-over component, as well as a decoding circuit arrangement for decoding the switching code signals and for contact with the fade-over component. To achieve a field-exact switchover, i.e. one undetectable by the viewer, a synchronous frame detector arrangement is additionally provided, which field-exactly switches over the fade-over component from the original program to the synchronously transmitted substitute program in the vertical black-out gap.