Most antennas are made in the shape of a dish to collect and reflect the radio waves to the sub reflector, in the same way as a curved mirror focuses visible light to one point.
大多数天线被制成碟形，用以收集和反射无线电波至亚反射器，就像曲面镜将可见光聚焦于一点一样。
2
The Cincinnati-based company created one of the first radio soap operas as a way to market its products, and years later it created its own soap operas, including “As the World Turns,” for television.