EntityQ1753030· pop 8· linked from 22 articlesMaximum usable frequencySign in to savehighest radio frequency that can be used for skywave radio transmissionConnectionstimeEntityradioEntityInternational Standard Book NumberEntityradio waveEntityreflectionEntityionosphereEntityionizationEntityrefractive indexEntityshortwave radioEntityradio frequencyEntitytransmissionEntityDXingEntityrule of thumbEntityskywaveEntityangle of incidenceEntityradio propagationEntityKennelly-Heaviside layerEntityGeneral Services AdministrationEntityNear Vertical Incidence SkywaveEntitycopyright status of works by the federal government of the United StatesEntityCategoriesRadio frequency propagation