noun
booster station
A relay station that amplifies and retransmits signals, used in TV/radio broadcasting or telecommunications.
山の上にテレビのブースター局が設置された。
A TV booster station was set up on the mountain.
中継局 is a general relay station, while ブースター局 specifically emphasizes signal amplification.
Compound of English loanword ブースター (booster) and 局 (station, office).