The invention relates to a method for transmission by optimal diffusion over a single frequency network (SFN) in which a plurality of transmitters transmit signals to receivers according to one transmission configuration among a plurality of transmission configurations, characterised in that said method comprises the transmission of one or more test-message samples, each one of which corresponds to a configuration to be tested, selected among at least some of the possible transmission configurations, each test-message sample having a header which enables the transmission configuration to which said sample corresponds to be identified, as well as said test samples to be received and decoded by at least some of said receivers in order to generate, for at least one of said test samples, at least one parameter that is representative of the reception quality of the corresponding transmission configuration. The invention also relates to a test receiver, a head-end and a mobility management unit for implementing such a method.