Some embodiments are directed to an unmanned vehicle for transmitting signals. The unmanned vehicle includes a transmitting unit that is configured to transmit a signal towards an object. The unmanned vehicle also includes a control unit that is in communication with at least one companion unmanned vehicle. The control unit is configured to determine a position of the at least one companion unmanned vehicle relative to the unmanned vehicle. The control unit is further configured to control the transmitting element based on at least the position of the at least one unmanned vehicle such that the transmitting element forms a phased-array transmitter with a transmitting element of the at least one companion unnamed vehicle, the phased-array transmitter emitting a transmission beam in a predetermined direction.