A flight vehicle being a multicopter, the flight vehicle comprising: a plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d); and a controller, wherein each antenna of the plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) has a plurality of antenna elements (42a, 42b; 42a, 42b, 42c; 42a, 42b, 42c, 42d) capable of receiving and/or transmitting signals and one or more phase shifters (43a; 43a, 43b; 43a, 43b, 43c), the antenna elements are disposed to configure a linear array antenna along the longitudinal direction of the antenna, the one or more phase shifters (43a; 43a, 43b; 43a, 43b, 43c) are capable of controlling the direction of the antenna into a conical range (A1; A2; A3; A4) by controlling phases of signals received or transmitted to the plurality of antenna elements (42a, 42b; 42a, 42b, 42c; 42a, 42b, 42c, 42d), the conical range (A1; A2; A3; A4) includes only sides and periphery of the sides of a cone, the central axis of the cone is the longitudinal direction of the antenna, the controller is configured to execute a relaying process, the relaying process includes: a process of receiving information from sources (T1; T2; T3) located in the conical range (A1; A2; A3; A4) by one or more antennas (4a; 4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) of the plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d), a process of transmitting the information by one or more antennas (4a; 4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) of the plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) to destinations (R1; R2; R3) located in the conical range (A1; A2; A3; A4), the controller is also configured to be capable to execute a process of controlling the flight state of the flight vehicle to keep the position of the flight vehicle being a predetermined position for receiving signals. a plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d); and a controller, wherein each antenna of the plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) has a plurality of antenna elements (42a, 42b; 42a, 42b, 42c; 42a, 42b, 42c, 42d) capable of receiving and/or transmitting signals and one or more phase shifters (43a; 43a, 43b; 43a, 43b, 43c), the antenna elements are disposed to configure a linear array antenna along the longitudinal direction of the antenna, the one or more phase shifters (43a; 43a, 43b; 43a, 43b, 43c) are capable of controlling the direction of the antenna into a conical range (A1; A2; A3; A4) by controlling phases of signals received or transmitted to the plurality of antenna elements (42a, 42b; 42a, 42b, 42c; 42a, 42b, 42c, 42d), the conical range (A1; A2; A3; A4) includes only sides and periphery of the sides of a cone, the central axis of the cone is the longitudinal direction of the antenna, the controller is configured to execute a relaying process, the relaying process includes: a process of receiving information from sources (T1; T2; T3) located in the conical range (A1; A2; A3; A4) by one or more antennas (4a; 4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) of the plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d), a process of transmitting the information by one or more antennas (4a; 4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) of the plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) to destinations (R1; R2; R3) located in the conical range (A1; A2; A3; A4), the controller is also configured to be capable to execute a process of controlling the flight state of the flight vehicle to keep the position of the flight vehicle being a predetermined position for receiving signals. a process of receiving information from sources (T1; T2; T3) located in the conical range (A1; A2; A3; A4) by one or more antennas (4a; 4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) of the plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d), a process of transmitting the information by one or more antennas (4a; 4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) of the plurality of linear array antennas (4a, 4b; 4a, 4b, 4c; 4a, 4b, 4c, 4d) to destinations (R1; R2; R3) located in the conical range (A1; A2; A3; A4), the controller is also configured to be capable to execute a process of controlling the flight state of the flight vehicle to keep the position of the flight vehicle being a predetermined position for receiving signals.