The Amateur Radio Project - Propagation

# Propagation

### Question 27 of 30

In the HF bands, maximum transmitting distance is achieved by

1. ground wave
2. multiple refraction by the D-layer, and multiple reflection by earth
3. a refraction by the F1-layer
4. multiple refraction by the F2-layer, and multiple reflection by earth

1 | 2 | 3 | 4

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