In modern radio technology components such as communication, broadcast, television and radar system, the radiation and receiving of the radio waves are inevitably, then antenna is needed.
通信、广播、电视、雷达、导航等无线电技术设备中，都需要有无线电波的辐射和接收，进而离不开天线设备。
2
Almost 7 million birds are killed each year when they fly into communication towers that broadcast TV and radio and make cellphone conversations possible.