noun
beam antenna
Technical term for a directional antenna that concentrates radio waves in a narrow beam.
アマチュア無線家は屋根にビームアンテナを設置した。
The amateur radio operator installed a beam antenna on the roof.
Variant with a middle dot, sometimes used for clarity.
アンテナ is a general antenna, while ビームアンテナ specifically refers to a directional beam antenna.
Loanword from English 'beam antenna'.