The paper 'Radio communication via Near Vertical Incidence Skywave propagation: an overview' by Rosa Ma Alsina-Pagès and Ben A. Witvliet is now available 

Near Vertical Incidence Skywave (NVIS) propagation can be used for radio communication in a large area (200 km radius) without any intermediate human-made infrastructure. It is therefore especially suited for disaster relief communication, communication in developing regions and applications where independence of local infrastructure is desired, such as military applications. 

NVIS communication uses frequencies between approximately 3 and 10 MHz. A comprehensive overview of NVIS research is given, covering propagation, antennas, diversity, modulation and coding. Both the bigger picture and the important details are given, as well as the relation between them.

Download - https://link.springer.com/article/10.1007/s11235-017-0287-2