Final answer:
Radio communication is divided into different frequencies such as HF (3-30 MHz) for long-distance, VHF (30-300 MHz) covering the FM radio band and certain TV channels, and UHF (300 MHz-3 GHz) offering better urban communication capability.
Step-by-step explanation:
Radio communication frequencies are categorized into different bands, each with their own characteristics and uses.
High Frequency (HF)
HF bands range from 3 to 30 MHz and are used for long-distance communication, such as international broadcasting and aviation communications, because they can be reflected off the ionosphere.
Very High Frequency (VHF)
VHF bands span from 30 to 300 MHz, with television channels utilizing frequencies in the range of 54 to 88 MHz and 174 to 222 MHz. The FM radio band also falls within this range, lying between 88 MHz and 174 MHz. VHF is used for TV broadcasting, line-of-sight ground communication, and civil aviation.
Ultra High Frequency (UHF)
UHF bands cover 300 MHz to 3 GHz. TV channels called UHF utilize a frequency range of 470 to 1000 MHz. UHF is well suited for urban communication because it is less affected by buildings and can penetrate them better than lower frequencies.