Dish aerial and Directional antenna

Dish aerial noun - Directional antenna consisting of a parabolic reflector for microwave or radio frequency radiation.

Directional antenna and dish aerial are semantically related. In some cases you can use "Directional antenna" instead a noun phrase "Dish aerial".

Directional antenna noun - An antenna that transmits or receives signals only in a narrow angle.

Dish aerial and directional antenna are semantically related. Sometimes you can replace phrase "Dish aerial" with "Directional antenna", this phrases are similar.