Mobile telecommunication device r adapted to be mounted on an airborne aircraft for establishing a telecommunication connection in the radio frequency range with a base station (102; 104; 1100), the mobile telecommunication device comprising: - at least a first and a second antenna, wherein the first antenna is adapted for communication with a base station located on the ground behind the aircraft, and wherein the second antenna is adapted for communication with a base station located on the ground in front of the aircraft, and - an electromagnetic shield adapted to reflect and shield electromagnetic radiation impinging on a first side of the electromagnetic shield such that at least a portion of the radiation is reflected towards the first antenna, for reflecting electromagnetic radiation impinging on a second side of the electromagnetic shield such that at least a portion of the radiation is reflected towards the second antenna, for preventing a reception of signals at the second antenna that are transmitted by the first antenna and for preventing a reception of further signals at the first antenna that are transmitted by the second antenna, wherein the electromagnetic shield is located between the first and the second antenna, wherein the first side of the r electromagnetic shield faces towards the first antenna and the second side of the electromagnetic shield faces towards the second antenna, and the mobile telecommunication device further comprising a logic component, and wherein the first and the second antenna are adapted to transmit and receive telecommunication signals of the same frequency band, and wherein the logic component is adapted to select whether the first or the second antenna is used for the telecommunication connection with one of said base stations. - at least a first and a second antenna, wherein the first antenna is adapted for communication with a base station located on the ground behind the aircraft, and wherein the second antenna is adapted for communication with a base station located on the ground in front of the aircraft, and - an electromagnetic shield adapted to reflect and shield electromagnetic radiation impinging on a first side of the electromagnetic shield such that at least a portion of the radiation is reflected towards the first antenna, for reflecting electromagnetic radiation impinging on a second side of the electromagnetic shield such that at least a portion of the radiation is reflected towards the second antenna, for preventing a reception of signals at the second antenna that are transmitted by the first antenna and for preventing a reception of further signals at the first antenna that are transmitted by the second antenna, wherein the electromagnetic shield is located between the first and the second antenna, wherein the first side of the r electromagnetic shield faces towards the first antenna and the second side of the electromagnetic shield faces towards the second antenna, and the mobile telecommunication device further comprising a logic component, and wherein the first and the second antenna are adapted to transmit and receive telecommunication signals of the same frequency band, and wherein the logic component is adapted to select whether the first or the second antenna is used for the telecommunication connection with one of said base stations.