HF
From The RadioReference Wiki
"HF" is an abbreviation for "High Frequency."
High frequency communications occur in the 0.5-30 MHz band.
160 Meters (1.800-2.000 MHz) 80 Meters (3.500-4.000 MHz) 40 Meters (7.000-7.300 MHz) 30 Meters (10.100-10.150 MHz) 20 Meters (14.000-14.350 MHz) 17 Meters (18.068-18.168 MHz) 15 Meters (21.0-21.45 MHz) 12 Meters (24.89-24.99 MHz) 10 Meters (28-29.7 MHz)
28.400 National 10 Meter call frequency
3.870Mhz Texas Traders Net every friday at 7pm