Which frequency has the greatest range?

The range of a radio frequency in amateur radio is influenced by various factors, including transmitter power, antenna characteristics and current propagation conditions. However, in general, lower frequencies, such as those on the longwave, mediumwave and shortwave bands (160m to 10m), have the ability to cover greater distances, especially at night. These bands often allow what is known as ionospheric reflection, where radio waves are bent from the ionosphere back to Earth, which is less common at higher frequencies typical of VHF (Very High Frequency) and UHF (Ultra High Frequency). The shortwave bands in particular, often between 3 MHz and 30 MHz, are known for their ability to communicate worldwide under favorable conditions.