an aerial system, such as a Yagi aerial, having directional properties
Also called (esp US): beam antenna
beam antenna in American English
noun
Radio
an antenna that transmits its radiation in a particular direction
Word origin
[1930–35]This word is first recorded in the period 1930–35. Other words that entered Englishat around the same time include: boondoggle, cloverleaf, hypercorrection, saddle stitch, uncertainty principle