Notes
1. As you can see a good ground conductivity is the main factor for the best NVIS gain (near 90º takeoff angle).
2. With a good ground conductivity the optimal height of a 80m NVIS dipole is from 10m to 18m.
3. With a poor ground conductivity the optimal height of a 80m NVIS dipole is a bit higher, from 12m to 20m.
4. If you are targeting longer range (200km or more) the optimal antenna height is higher.

See also
Radiation patterns
Takeoff angle calculator

Update 2021-09-13 OH7SV

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