Very high frequency

The VHF TV band in Australia was originally allocated channels 1 to 10-with channels 2, 7 and 9 assigned for the initial services in Sydney and Melbourne, and later the same channels were assigned in Brisbane, Adelaide and Perth. Other capital cities and regional areas used a combination of these and other frequencies as available. The initial commercial services in Hobart and Darwin were respectively allocated channels 6 and 8 rather than 7 or 9.

By the early 1960s it became apparent that the 10 VHF channels were insufficient to support the growth of television services. This was rectified by the addition of three additional frequencies-channels 0, 5A and 11. Older television sets using rotary dial tuners required adjustment to receive these new channels. Most TVs of that era were not equipped to receive these broadcasts, and so were modified at the owners' expense to be able to tune into these bands; otherwise the owner had to buy a new TV.

Several TV stations were allocated to VHF channels 3, 4 and 5, which were within the FM radio bands although not yet used for that purpose. A couple of notable examples were NBN-3 Newcastle, WIN-4 Wollongong and ABC Newcastle on channel 5. While some Channel 5 stations were moved to 5A in the 1970s and 80s, beginning in the 1990s, the Australian Broadcasting Authority began a process to move these stations to UHF bands to free up valuable VHF spectrum for its original purpose of FM radio. In addition, by 1985 the federal government decided new TV stations are to be broadcast on the UHF band.

Two new VHF channels, 9A and 12, have since been made available and are being used primarily for digital services (e.g. ABC in capital cities) but also for some new analogue services in regional areas. Because channel 9A is not used for television services in or near Sydney, Melbourne, Brisbane, Adelaide or Perth, digital radio in those cities are broadcast on DAB frequencies blocks 9A, 9B and 9C.

VHF radio is also used for marine Radio[3] as per its long-distance reachability comparing UHF frequencies.

Example allocation of VHF–UHF frequencies:[4]

• Radionavigation 60: 84–86 MHz
• Fixed Maritime Mobile: 130–135.7 MHz
• Fixed Aeronautical radio navigation: 160–190 MHz
• Broadcasting Aeronautical Radionavigation: 255–283.5 MHz
• Aeronautical Radionavigation AUS 49 / Maritime Radionavigation (radiobeacons) 73: 315–325 MHz

• 44–51, 54–68 MHz: Band I Television (channels 1–3)
• 87.5–108 MHz: Band II Radio
• 118–137 MHz: Airband for air traffic control, AM
  • 108–117.975 MHz: Air navigation beacons VOR and ILS
  • 121.5 MHz is an emergency frequency
• 144–148 MHz: Amateur radio 2-meter band
• 156–162.2 MHz: Marine radio
• 174–230 MHz: Band III Television (channels 4–11)

Until 2013, the four main free-to-air TV stations in New Zealand used the VHF television bands (Band I and Band III) to transmit to New Zealand households. Other stations, including a variety of pay and regional free-to-air stations, were forced to broadcast in the UHF band, since the VHF band had been very overloaded with four stations sharing a very small frequency band, which was so overcrowded that one or more channels would not be available in some smaller towns.

However, at the end of 2013, all television channels stopped broadcasting on the VHF bands, as New Zealand moved to digital television broadcasting, requiring all stations to either broadcast on UHF or satellite (where UHF was unavailable) utilising the Freeview service.[5]

Refer to Australasian television frequencies for more information.

British television originally used VHF band I and band III. Television on VHF was in black and white with 405-line format (although there were experiments with all three colour systems-NTSC, PAL, and SECAM-adapted for the 405-line system in the late 1950s and early 1960s).

British colour television was broadcast on UHF (channels 21–69), beginning in the late 1960s. From then on, TV was broadcast on both VHF and UHF (VHF being a monochromatic downconversion from the 625-line colour signal), with the exception of BBC2 (which had always broadcast solely on UHF). The last British VHF TV transmitters closed down on January 3, 1985. VHF band III is now used in the UK for digital audio broadcasting, and VHF band II is used for FM radio, as it is in most of the world.

Unusually, the UK has an amateur radio allocation at 4 metres, 70–70.5 MHz.

Frequency assignments between US and Canadian users are closely coordinated since much of the Canadian population is within VHF radio range of the US border. Certain discrete frequencies are reserved for radio astronomy. The general services in the VHF band are:

• 30–49.6 MHz: Licensed 2-way land mobile communication, with various sub-bands.[lower-alpha 1]
• 30–88 MHz: Military VHF FM, including SINCGARS
• 43–50 MHz: Cordless telephones, 49 MHz FM walkie-talkies and radio controlled toys, and mixed 2-way mobile communication. The FM broadcast band originally operated here (42–50 MHz) before it was moved to 88–108 MHz.
• 50–54 MHz: Amateur radio 6-meter band
  • 50.8–51 MHz: Radio-controlled aircraft (on ten fixed frequencies at 20 kHz spacing) with an FCC Amateur Radio Service license, flown under FCC Part 97, rule 97.215.[6]
• 54–88 MHz, known as "Band I" internationally; some DTV stations will appear here. See Pan-American television frequencies.
  • 54–72 MHz TV channels 2–4 (VHF-Lo)
  • 72–76 MHz: Radio controlled models, industrial remote control, and other devices. Model aircraft operate on 72 MHz while surface models operate on 75 MHz in the US and Canada, air navigation beacons 74.8–75.2 MHz.
  • 76–88 MHz TV channels 5–6 (VHF-Lo)
• 87.5–108 MHz: FM radio broadcasting (87.9–91.9 non-commercial, 92–108 commercial in the United States) (known as "Band II" internationally)
• 108–118 MHz: Air navigation beacons VOR
• 118–137 MHz: Airband for air traffic control, AM
  • 121.5 MHz is an emergency frequency
• 137–138 MHz Space research, space operations, meteorological satellite[7]
• 138–144 MHz: Land mobile, auxiliary civil services, satellite, space research, and other miscellaneous services
• 144–148 MHz: Amateur radio 2-meter band
• 148–150 MHz: Land mobile, fixed, satellite
• 150–156 MHz: "VHF business band," public safety, the unlicensed Multi-Use Radio Service (MURS), and other 2-way land mobile, FM
• 156–158 MHz VHF Marine Radio
  • 156.8 MHz (Channel 16) is the maritime emergency and contact frequency.
• 159.81-161.565 MHz railways [lower-alpha 2]
  • 159.81–160.2 are railroads in Canada only and is used by trucking companies in the U.S.
• 160.6–162 Wireless microphones and TV/FM broadcast remote pickup
• 162.4–162.55: NOAA Weather Stations, narrowband FM, Weatheradio Canada Stations
• 174–240 MHz, known as "Band III" internationally. A number of DTV channels have begun broadcasting here, especially many of the stations which were assigned to these channels for previous analog operation.
  • 174–216 MHz television channels 7–13 (VHF-Hi)
  • 174–216 MHz: professional wireless microphones (low power, certain exact frequencies only)
  • 216–222 MHz: land mobile, fixed, maritime mobile,[7]
  • 222–225 MHz: 1.25 meters (US) (Canada 219–220, 222–225 MHz) amateur radio
• 225 MHz and above (UHF): Military aircraft radio, 243 MHz is an emergency frequency (225–400 MHz) AM, including HAVE QUICK, dGPS RTCM-104

Cable television, though not transmitted aerially, uses a spectrum of frequencies overlapping VHF.[8]

The U.S. FCC allocated television broadcasting to a channelized roster as early as 1938 with 19 channels. That changed three more times: in 1940 when Channel 19 was deleted and several channels changed frequencies, then in 1946 with television going from 18 channels to 13 channels, again with different frequencies, and finally in 1948 with the removal of Channel 1 (analog channels 2–13 remain as they were, even on cable television).[9] Channels 14–19 later appeared on the UHF band, while channel 1 remains unused.

87.5–87.9 MHz is a radio frequency which, in most of the world, is used for FM broadcasting. In North America, however, this bandwidth is allocated to VHF television channel 6 (82–88 MHz). The analog audio for TV channel 6 is broadcast at 87.75 MHz (adjustable down to 87.74). Several stations, known as Frankenstations, most notably those joining the Pulse 87 franchise, have operated on this frequency as radio stations, though they use television licenses. As a result, FM radio receivers such as those found in automobiles which are designed to tune into this frequency range could receive the audio for analog-mode programming on the local TV channel 6 while in North America. The practice largely ended with the DTV transition in 2009, although some still exist.

The FM broadcast channel at 87.9 MHz is normally off-limits for FM audio broadcasting; it is reserved for displaced class D stations which have no other frequencies in the normal 88.1–107.9 MHz subband to move to. So far, only two stations have qualified to operate on 87.9 MHz: 10–watt KSFH in Mountain View, California and 34–watt translator K200AA in Sun Valley, Nevada.