What is 30 m?

30 m (30 meters) is a wavelength band within the high frequency (HF) radio spectrum. It has a frequency range of 10.1-10.15 MHz and a wavelength range of 30-10 meters. It is also known as the 10 MHz band. This band is used for amateur radio communication and is noted for long-distance communication during the day and early evening hours. Its propagation characteristics are affected by the ionosphere, which can cause signal reflection and refraction. The 30 m band is regulated by the International Telecommunications Union (ITU) and is allocated for amateur radio use in most countries.