Why The ITU divides the spectrum into decades, each band spanning from X to 10X. Ultra High Frequency (UHF) runs from 300 MHz to 3000 MHz (3 GHz), which corresponds to wavelengths of 1 meter down to 10 centimeters. The ham bands at 70 cm (420-450 MHz), 33 cm, and 23 cm all fall in UHF.
Watch out The 30 to 300 MHz choice is VHF, the band just below UHF that contains the popular 2 meter and 6 meter bands, so watch the units and the decade carefully.
HF 3-30 MHz, VHF 30-300 MHz, UHF 300-3000 MHz: each step multiplies by 10.
70 cm at 440 MHz is UHF. Pick the range that holds 440: 300 to 3000 MHz.