전파를 전리층에 반사시키거나 지표파를 이용하여 수평선 너머의 대상을 탐지하거나 통신하는 방식과 관련된.
Relating to radar or communication systems capable of detecting targets or transmitting signals beyond the curvature of the Earth or the visual horizon.
예문:
"The military deployed an OTH radar system to monitor long-range aerial activity across the ocean."
"OTH communications are essential for maintaining contact with vessels that have sailed past the line of sight."