A wind measurement apparatus comprising: a frame assembly; and four transducers mounted to the frame assembly such that their respective locations serve as respective vertices of a regular tetrahedron, characterized in that the apparatus comprises a reflector assembly mounted to the frame assembly such that it is positioned substantially at a center of said regular tetrahedron at a distance from the transducers to allow for an airflow between the reflector assembly and each of the transducers, wherein the reflector assembly comprises a reflector element provided as a solid that has eight vertices and six substantially identical concave faces that serve as respective reflector surfaces and that is oriented with respect to said transducers such that each transducer (112-k) is facing a respective vertex of the reflector element, wherein each transducer (112-k) is arranged to: transmit a respective measurement signal in a respective transmitter beam, TX beam, towards the reflector assembly such that the respective TX beam meets the three reflector surfaces that meet at the vertex of the reflector element faced by the respective transducer (112-k), and receive, via said three reflector surfaces, respective partial reflections of respective TX beams originating from other ones of said transducers, and wherein said measurement signals comprise respective ultrasonic measurement signals and wherein the apparatus further comprises a control portion arranged to: operate said transducers to transmit the respective measurement signal in the respective TX beams and to capture the respective measurement signals received in the respective partial reflections of the respective TX beams transmitted from the other ones of said transducers, and derive one or more wind characteristic based on respective propagation delays of the respective measurement signals transmitted from said transducers and captured at the other ones of said transducers. a frame assembly; and four transducers mounted to the frame assembly such that their respective locations serve as respective vertices of a regular tetrahedron, characterized in that the apparatus comprises a reflector assembly mounted to the frame assembly such that it is positioned substantially at a center of said regular tetrahedron at a distance from the transducers to allow for an airflow between the reflector assembly and each of the transducers, wherein the reflector assembly comprises a reflector element provided as a solid that has eight vertices and six substantially identical concave faces that serve as respective reflector surfaces and that is oriented with respect to said transducers such that each transducer (112-k) is facing a respective vertex of the reflector element, wherein each transducer (112-k) is arranged to: transmit a respective measurement signal in a respective transmitter beam, TX beam, towards the reflector assembly such that the respective TX beam meets the three reflector surfaces that meet at the vertex of the reflector element faced by the respective transducer (112-k), and receive, via said three reflector surfaces, respective partial reflections of respective TX beams originating from other ones of said transducers, and transmit a respective measurement signal in a respective transmitter beam, TX beam, towards the reflector assembly such that the respective TX beam meets the three reflector surfaces that meet at the vertex of the reflector element faced by the respective transducer (112-k), and receive, via said three reflector surfaces, respective partial reflections of respective TX beams originating from other ones of said transducers, and wherein said measurement signals comprise respective ultrasonic measurement signals and wherein the apparatus further comprises a control portion arranged to: operate said transducers to transmit the respective measurement signal in the respective TX beams and to capture the respective measurement signals received in the respective partial reflections of the respective TX beams transmitted from the other ones of said transducers, and derive one or more wind characteristic based on respective propagation delays of the respective measurement signals transmitted from said transducers and captured at the other ones of said transducers. operate said transducers to transmit the respective measurement signal in the respective TX beams and to capture the respective measurement signals received in the respective partial reflections of the respective TX beams transmitted from the other ones of said transducers, and derive one or more wind characteristic based on respective propagation delays of the respective measurement signals transmitted from said transducers and captured at the other ones of said transducers.