noun
Refers to the sensory appendages of insects, crustaceans, and other arthropods. In everyday Japanese, 触角 is the standard zoological term.
カブトムシの触角はとても敏感だ。
A rhinoceros beetle's antennae are very sensitive.
アリは触角で仲間とコミュニケーションをとる。
Ants communicate with each other using their antennae.
アンテナ is a loanword from English 'antenna' and is used for both biological and technological contexts (e.g., TV antenna). 触角 is specifically the biological term for insect/arthropod feelers.
Compound of 触 (touch, feel) and 角 (horn). The reading しょっかく is the on'yomi of both characters, with gemination (促音) of the first character's final く.