A radio receiver and directional antenna used as a system to determine the angular direction of incoming radio signals.
无线方向探测器一种无线电接收和指向天线系统，用来确定收到的无线电信号的角方向
Something, such as a directional symbol, that is similar to an arrow in form or function.
箭头形符号功能或形式类似箭头的某物，如用于指示方向的符号
Having no particular directional characteristics.
无定向的具有无特定方向的特征
