A base station comprising: an enclosure including: at least one pole connectable part (116, 117, 118) to be connected to a communication pole; at least one upper antenna assembly combinable member disposed on at least one upper lateral side of the enclosure; at least one lower antenna assembly combinable member disposed on at least one lower lateral side of the enclosure; and at least one supporting member including a first fastening protrusion and disposed on at least one middle lateral side of the enclosure; and an antenna assembly including an antenna for communication and combined with the enclosure, and wherein the antenna assembly includes an elongated hole for engaging with the at least one supporting member, a width of the elongated hole being widened gradually toward the communication pole, and the antenna assembly is rotated at a predetermined angle on the at least one antenna assembly combinable member (111, 112) which operates as a pivot, and wherein the antenna assembly is rotated at the predetermined angle, by combining the at least one upper antenna assembly combinable member with the antenna assembly and releasing combination the at least one lower antenna assembly combinable member with the antenna assembly, or by combining the at least one lower antenna assembly combinable member with the antenna assembly and releasing combination the at least one upper antenna assembly combinable member with the antenna assembly. an enclosure including: at least one pole connectable part (116, 117, 118) to be connected to a communication pole; at least one upper antenna assembly combinable member disposed on at least one upper lateral side of the enclosure; at least one lower antenna assembly combinable member disposed on at least one lower lateral side of the enclosure; and at least one supporting member including a first fastening protrusion and disposed on at least one middle lateral side of the enclosure; and at least one pole connectable part (116, 117, 118) to be connected to a communication pole; at least one upper antenna assembly combinable member disposed on at least one upper lateral side of the enclosure; at least one lower antenna assembly combinable member disposed on at least one lower lateral side of the enclosure; and at least one supporting member including a first fastening protrusion and disposed on at least one middle lateral side of the enclosure; and an antenna assembly including an antenna for communication and combined with the enclosure, and wherein the antenna assembly includes an elongated hole for engaging with the at least one supporting member, a width of the elongated hole being widened gradually toward the communication pole, and the antenna assembly is rotated at a predetermined angle on the at least one antenna assembly combinable member (111, 112) which operates as a pivot, and wherein the antenna assembly is rotated at the predetermined angle, by combining the at least one upper antenna assembly combinable member with the antenna assembly and releasing combination the at least one lower antenna assembly combinable member with the antenna assembly, or by combining the at least one lower antenna assembly combinable member with the antenna assembly and releasing combination the at least one upper antenna assembly combinable member with the antenna assembly.