This video explains the fundamental principles of near vertical incidence skywave (NVIS) propagation, including the importance of incidence angle, frequency, and common antenna types.
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Index:
0:36 Review of skywave propagation
1:30 Skip zones
2:14 NVIS overview
3:20 Practical advantages of NVIS
4:25 Operational advantages of NVIS
5:50 NVIS disadvantages
6:33 NVIS frequencies
7:52 NVIS antenna overview
8:55 Elevation and azimuth patterns
11:12 Common NVIS antenna types
15:03 Mobile NVIS antennas
16:46 Skywave vs. Groundwave
17:41 Summary