The present invention relates to a communication technique which fuses a 5G communication system with IoT technology to support higher data transmission rates after a 4G system, and system thereof. In addition, the present invention provides an antenna assembly which comprises: an antenna array which includes at least one antenna; a film layer which is made of at least one insulating material, spaced apart from the antenna array by a predetermined first distance and joined to one side of a window; and an installation aid which has a surface fixed and attached to the window and the other surface on which an antenna array seating portion is formed.