The disclosure refers to a roof antenna module and to a method for operating the roof antenna module, wherein a communication control unit couples at least one transceiver with at least one bus connection and communication messages are transmitted between the at least one transceiver and the at least one bus connection. This approach prevents undesired manipulation of the motor vehicle from the outside. This approach uses a filter device of the communication control unit, that forwards a control instruction to the at least one bus connection if the control instruction fulfills a predetermined safety criterion.