NVIS

Near Vertical Incidence Skywave

1. What is NVIS?
   • NVIS = High "angle of radiation" or "takeoff angle"
   • NVIS = no skip zone!
   • NVIS coverage = 0 - 300 miles
   • The magic is in:
     • Antenna (e.g. horizontal wire antenna .05 - .25 wavelengths above ground)
     • Right frequency at the right time
     • Coordinating with other parties about freq/time
     • High power (or digital modes) when conditions are marginal
   • NVIS propagation details
   • NVIS advantages & disadvantages
2. Applications of NVIS
3. Antennas for NVIS
4. NVIS Frequency Selection