HF High Frequency – 3 to 30 MHz; Amateur HF bands are: 80m (3.5 MHz) 60m (5.3 MHz) 40m (7 MHz) 30m (10.1 MHz) 20m (14 MHz) 17m (18 MHz) 15m (21 MHz) 12m (24 MHz) 10m (28 MHz) Learn more:Wikipedia article