Later,Amelia's radio signals were received by a United States Coast Guard ship near the island.

VOA: special.2010.05.26

It's all very mysterious and we send off a spaceship to investigate the markings, the radio signals from the other place.

一切都很神秘,所以我们,派遣一艘飞船去调查星球上的印记,以及那些从其他星球传来的无线电信号

耶鲁公开课 - 死亡课程节选

All of the systems on the Mercury spacecraft sent radio signals to flight controllers.

VOA: special.2009.06.17

The radio signals got weaker and weaker.

VOA: special.2010.05.26

Marconi sent the first radio communication signals through the air in eighteen ninety-five.

VOA: special.2010.01.31

While TV and Radio Marti have received praised for broadcasting news to people in Cuba, where the government jams foreign signals, TV Marti continues to face internal and external criticism.

VOA: standard.2009.06.18