Device for receiving and sending signals for a radio network, having the following features: - having an air interface with an MIMO antenna at least in the form of a dual-polarised antenna or in the form of two antennae for carrying out an MIMO operation at least in a radio device, i.e. in the downlink or in the uplink operation, - having at least one sending amplifier and having at least two receiving amplifiers (36a, 36b), - the at least one sending amplifier and the at least two receiving amplifiers (36a, 36b) are connected to a house distribution network in which receipt signals obtained via the air interface are fed in, and sending signals obtained via the house distribution network can be supplied to the air interface; - a frequency conversion device on the side of the antenna is provided between the air interface and the house distribution network, - the frequency conversion device on the antenna side comprises at least one frequency converter, 38b), by means of which a) the receipt signals (Sd) obtained via the at least one polarisation (P1 or P2) of the dual-polarised antenna; or b) the receipt signals (Sd) obtained via the at least one of the at least two antennae with a sending frequency (fd) in an intermediary range (fd1, fd2) free and/or unused in the house distribution network can be converted, - at least one frequency back-conversion device on the side of the receiver is provided between the house distribution network and a receiver, - the frequency back-conversion device on the receiver side is constructed in such a way that a frequency back-conversion of the frequencies (fd1, fd2) converted in the free and/or unused intermediary frequency range can be fed back via this into the received frequency range (fd), - the frequency conversion device comprises two downlink paths (DLA; 35a, 35b) on the antenna side on which the signals (Sd) received via the at least two antennae or via the at least two polarisations (P1, P2) of the at least one dual-polarised antenna can be converted separately in each case into different intermediary frequency ranges (fd1, fd2) which lie offset in relation to one another, and - the two downlink paths (DLA; 35a, 35b) on the antenna side each comprise a frequency converter (38a, 38b) of the frequency conversion device on the antenna side, wherein a local oscillator (LO1, LO2) is respectively allocated to the frequency converters (38a, 38b) for the frequency conversion, and the two local oscillators (LO1, LO2) are synchronised with each other by means of a common reference oscillator. - having an air interface with an MIMO antenna at least in the form of a dual-polarised antenna or in the form of two antennae for carrying out an MIMO operation at least in a radio device, i.e. in the downlink or in the uplink operation, - having at least one sending amplifier and having at least two receiving amplifiers (36a, 36b), - the at least one sending amplifier and the at least two receiving amplifiers (36a, 36b) are connected to a house distribution network in which receipt signals obtained via the air interface are fed in, and sending signals obtained via the house distribution network can be supplied to the air interface; - a frequency conversion device on the side of the antenna is provided between the air interface and the house distribution network, - the frequency conversion device on the antenna side comprises at least one frequency converter, 38b), by means of which a) the receipt signals (Sd) obtained via the at least one polarisation (P1 or P2) of the dual-polarised antenna; or b) the receipt signals (Sd) obtained via the at least one of the at least two antennae with a sending frequency (fd) in an intermediary range (fd1, fd2) free and/or unused in the house distribution network can be converted, a) the receipt signals (Sd) obtained via the at least one polarisation (P1 or P2) of the dual-polarised antenna; or b) the receipt signals (Sd) obtained via the at least one of the at least two antennae with a sending frequency (fd) in an intermediary range (fd1, fd2) free and/or unused in the house distribution network can be converted, - at least one frequency back-conversion device on the side of the receiver is provided between the house distribution network and a receiver, - the frequency back-conversion device on the receiver side is constructed in such a way that a frequency back-conversion of the frequencies (fd1, fd2) converted in the free and/or unused intermediary frequency range can be fed back via this into the received frequency range (fd), - the frequency conversion device comprises two downlink paths (DLA; 35a, 35b) on the antenna side on which the signals (Sd) received via the at least two antennae or via the at least two polarisations (P1, P2) of the at least one dual-polarised antenna can be converted separately in each case into different intermediary frequency ranges (fd1, fd2) which lie offset in relation to one another, and - the two downlink paths (DLA; 35a, 35b) on the antenna side each comprise a frequency converter (38a, 38b) of the frequency conversion device on the antenna side, wherein a local oscillator (LO1, LO2) is respectively allocated to the frequency converters (38a, 38b) for the frequency conversion, and the two local oscillators (LO1, LO2) are synchronised with each other by means of a common reference oscillator.