Get Hold Of The Ionosphere: Communications, Surveillance, And Direction Finding (Orbit: A Foundation Series) (Orbit, A Foundation Series) Penned By Leo F. McNamara Available Through Digital Format

The best introduction to ionospheric physics I've come across, In a simple, readerfriendly style, this introductory text describes the ionosphere and its effects on systems which use it, giving particular emphasis to HF communications as well as including sections on the single station location of HF transmitters and overthe horizon radar.
It is written for those who must understand or operate these systems and for those who just enjoy knowing how things work, A mustread book for the military highfrequency communicator, .