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 160m NVIS dipole is from 18m to 38m.
3. With a poor ground conductivity the optimal height of a 160m NVIS dipole is higher, from 22m to 41m.
4. If you are targeting longer range (200km or more) the optimal antenna height is higher.

See also
Radiation patterns
Takeoff angle calculator

Update 2021-09-14 OH7SV

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