Probing The Sky With Radio Waves
From Wireless Technology to the Development of Atmospheric Science
Chen-Pang Yeang, Central, 538.767 Y38P 2013
Briefly noted. The development of long distance radio, and the characterization of the ionosphere. Amateurs did much of the early empirical work, but were pushed into the the shortwave bands as the longwave bands were commercialized and commandeered by governments.