- Sacramento Radio Weather — CM98
A personal HF propagation tool centered on a single Maidenhead grid, with separate scoring models for long-distance (DX) and short-range high-angle (NVIS) work The geometric intuition: DX cares about how the bands behave at low elevation angles over long paths, so its model weights D-layer absorption heavily — that’s where most of the signal loss happens on a multi-thousand-kilometer hop
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