Correction device for a coupling between a transmitter antenna (AntEm) and a receiver antenna (AntRec) of an isofrequency retransmitter of digital data, the retransmitter receiving representative signals of a group of digital data blocks by way of a receiver antenna (AntRec), the retransmitter inserting the representative signals of at least one local digital data block into the representative signals of the group of digital data blocks which are received, in order to form representative signals of a new group of digital data blocks, comprising the at least one local digital data block and at least one digital data block received by the receiver antenna (AntRec), the retransmitter transmitting the representative signals of the new group of digital data blocks by way of a transmitter antenna (AntEm), characterized in that the correction of the coupling comprises: - Means of coding of the at least one local digital data block in the radio frequency range in order to form representative signals of the local digital data block, the at least one local digital data block being representative of a local audiovisual program, - Means of assessment of the coupling between the transmitter antenna and the receiver antenna solely on the basis of the representative signals of the at least one coded local digital data block and the part of the coupling signal of the at least one local digital data block transmitted by the transmitter antenna (AntEm) and received by the receiver antenna (AntRec), - Means of filtering the representative signals of the group of digital data blocks received, on the basis of the assessed coupling, - Means of insertion of the representative signals of the at least one coded local digital data block into the representative signals of the received group of digital data blocks, forming representative signals of the new group of digital data blocks, - Means of amplification and transmission by way of the transmitter antenna (AntEm) of the representative signals of the new group of digital data blocks. - Means of coding of the at least one local digital data block in the radio frequency range in order to form representative signals of the local digital data block, the at least one local digital data block being representative of a local audiovisual program, - Means of assessment of the coupling between the transmitter antenna and the receiver antenna solely on the basis of the representative signals of the at least one coded local digital data block and the part of the coupling signal of the at least one local digital data block transmitted by the transmitter antenna (AntEm) and received by the receiver antenna (AntRec), - Means of filtering the representative signals of the group of digital data blocks received, on the basis of the assessed coupling, - Means of insertion of the representative signals of the at least one coded local digital data block into the representative signals of the received group of digital data blocks, forming representative signals of the new group of digital data blocks, - Means of amplification and transmission by way of the transmitter antenna (AntEm) of the representative signals of the new group of digital data blocks.