Antenna device for transmitting high-frequency signals from or to a motor vehicle, comprising - a first radio module which is configured to provide high-frequency signals for transmission via an antenna; - an antenna module comprising the antenna for transmitting the high-frequency signals and a compensator; wherein - the antenna module is connected via a first antenna cable to the first radio module, wherein the first antenna cable is configured to convey the high-frequency signals between the antenna module and the first radio module and vice versa; wherein - the compensator is configured to modify a signal strength of the high-frequency signals according to a control signal; - a second radio module which is configured to provide high-frequency signals for transmission via the antenna; characterised in that the antenna module is connected via a second antenna cable to the second radio module, wherein the second antenna cable is configured to convey the high-frequency signals between the antenna module and the second radio module and vice versa; wherein - the first radio module and the second radio module are further configured to generate the control signal for controlling the compensator, wherein the second radio module is configured to modulate the control signal for the first radio module for controlling the compensator to the second antenna cable; - wherein the antenna device further has a signal path control device, wherein the signal path control device is configured to check which radio module does not transmit high-frequency signals, and to transmit the control signal of the respective radio module via the antenna cable of the radio module which does not transmit high-frequency signals. - a first radio module which is configured to provide high-frequency signals for transmission via an antenna; - an antenna module comprising the antenna for transmitting the high-frequency signals and a compensator; wherein - the antenna module is connected via a first antenna cable to the first radio module, wherein the first antenna cable is configured to convey the high-frequency signals between the antenna module and the first radio module and vice versa; wherein - the compensator is configured to modify a signal strength of the high-frequency signals according to a control signal; - a second radio module which is configured to provide high-frequency signals for transmission via the antenna; characterised in that the antenna module is connected via a second antenna cable to the second radio module, wherein the second antenna cable is configured to convey the high-frequency signals between the antenna module and the second radio module and vice versa; wherein - the first radio module and the second radio module are further configured to generate the control signal for controlling the compensator, wherein the second radio module is configured to modulate the control signal for the first radio module for controlling the compensator to the second antenna cable; - wherein the antenna device further has a signal path control device, wherein the signal path control device is configured to check which radio module does not transmit high-frequency signals, and to transmit the control signal of the respective radio module via the antenna cable of the radio module which does not transmit high-frequency signals.