在短波通信发展以后,低频无线电(长波)虽然现在还有少量大功率的广播电台在工作,但作为通信渐渐被人遗忘了.低频无线电的传播多为地波传播,在距离不远的情况下,可以得到比较稳定的通信,尤其在山区,如有小山或深谷阻隔采用其它通信手段有困难的地方,用长波作为通信手段还是可取的. After the development of shortwave communication, low-frequency radio (longwave) is still being forgotten as a communication because a small number of high-power radio stations are still working at the moment.The transmission of low-frequency radio is mostly ground wave propagation, and in the case of not far away , It is possible to obtain a more stable communication, especially in mountainous areas, where it is difficult to use other means of communication by hills or deep valleys, and long wave as a means of communication is desirable.