These are not guesses — they're computed from real FT8/FT4 spots decoded worldwide in the last 15 minutes via PSKReporter. For each band we measure:

• Local activity — spots heard and sent near your grid square (this matters most)
• Time of day — exact solar elevation at your location, not a timezone guess
• Solar conditions — SFI and K-index adjustments
• Signal quality — average SNR across all spots on the band
• Path diversity — how many distinct propagation paths are active

The result is a 0-100 score per band, personalized to your location.

Check the band tiles above — green = open, yellow = marginal, red = rough.

Good: SFI 120+ and K-index 0-2. Higher bands open, DX contacts easier, signals strong.
Bad: SFI below 90 and K-index 4+. Stick to 40m/80m. Geomagnetic storms (K=5+) can kill HF.

A band can be open in Europe but dead in your area. We track activity at your 2-letter grid prefix (~300 mile region) to show what's actually working from where you are, not global averages.