Lexi Webster
In Australia, it is common to see large antennas mounted on cars. These antennas are often comically large, as noted by some drivers, and are used for various purposes, including high-frequency radio, mobile data, and police digital communication radio. While some people assume that these large antennas are solely for aesthetic reasons, they serve important functions, especially in remote or border areas with poor connections. Additionally, the antennas found on Australian cars differ from those in the United States, as CB radio in Australia operates on UHF, a higher band than the AM frequency used in the US.
| Characteristics | Values |
|---|---|
| Antenna type | CB, UHF, HF, Wi-Fi, high-frequency radio, cellular |
| Antenna use | Citizen's band radio, police digital communication radio, mobile data terminal, radar, WiFi |
| Mounting | Bumper-mounted, roof-mounted, mounted on bull bars |
| Size | Large, comically large |
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What You'll Learn
Antennas on Australian police cars can be used for high-frequency radio
The high-frequency antennas enable police officers to maintain contact with their headquarters, dispatch centres, and other units in the field. This capability is vital for effective law enforcement, allowing officers to receive real-time updates, coordinate responses to incidents, and request backup or specialised support when needed.
In addition to high-frequency radio, Australian police cars may also be equipped with a range of other antennas to support multiple communication systems. These can include cellular antennas for mobile data terminals, enabling internet access and the use of data-intensive applications. Shark fin antennas are often utilised for GPS, satellite radio, and cellular data connections.
To cater to different operational needs, police forces may employ various antenna types and mounting options. Magnetic mount antennas offer temporary solutions, while low-profile and ground plane independent models are designed for specialist vehicles. Concealed antennas are also used for special police units, ensuring discreet operations.
The specific frequencies used by Australian police forces for high-frequency radio communications have been documented and shared by enthusiasts. Frequencies such as 3752 kHz licensed to the NSW Police Force and 4560 kHz licensed to NSW, WA, and NT Police have been reported. These frequencies facilitate interstate communications, allowing officers to monitor and coordinate responses across state lines.
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Some Aussies have large bumper-mounted antennas
Firstly, it's important to understand the frequencies and uses of these antennas. In Australia, CB radio typically operates on UHF, which is a higher band than the US CB system. This means that a shorter antenna can be just as effective, if not more so, than a large antenna. So why do some Aussies opt for the larger bumper-mounted variety?
One possible reason is that the larger antennas are more durable and suitable for off-road driving. Australia is known for its vast and rugged landscapes, and many Aussies enjoy exploring the Outback or driving on unforgiving terrain. Larger antennas are less likely to be damaged by branches or other obstacles, and they can also handle the vibrations and impacts of off-road driving better than smaller antennas.
Additionally, the larger antennas may provide better signal strength and range in remote areas. While a shorter antenna is sufficient for urban or suburban areas, those living in rural or remote regions may benefit from the increased performance of a larger antenna. This is especially true for highway patrol cars operating in remote or border areas, where a strong and reliable connection is necessary for effective communication.
Lastly, some Aussies may simply prefer the aesthetic of a larger antenna. For some, it may be a matter of personal taste or a way to make their vehicle stand out. For others, it could be a sense of pride or a symbol of their love for the great Australian outdoors. Regardless of the reason, the large bumper-mounted antennas have become an iconic feature of some Australian cars.
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CB in Australia runs on UHF, a higher band than in the US
CB radio was not legal in Australia until 1977, despite its popularity in the US, where it had been legalised in 1949. In Australia, CB radio operates on UHF, an entirely different band from the US, which runs on 11MHz AM.
The UHF band in Australia is unique to the country and New Zealand, and it is illegal to use non-standard radios purchased outside of these countries. This is because they may interfere with licensed land-mobile services, as they do not share the same band plan, power output, and channels as UHF CB.
The Australian government has set aside 80 channels of free UHF CB two-way radio channels for the general public to use, ranging from 476.4250 to 477.4125 MHz. Channels outside of this band are reserved for commercial use and require a license to operate. Channels 5 and 35 are reserved for emergency use only.
The use of CB radio in Australia provides several advantages. Firstly, UHF CB radios allow users to scan all 80 channels to find active conversations. Additionally, a tiny 18 cm high quarter wave antenna on UHF can work just as well, if not better, than a large fiberglass antenna, making it a more practical and aesthetic choice for many users.
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Some Aussies use mobile HF setups, which require capacitive tuning capability
Some Aussies use mobile HF setups, which require a lot of capacitive tuning capability to get the antenna to resonate across a lower band. This is in contrast to the standard fiberglass half-dipole design. These setups are often used for HF (high-frequency) radio communications, which are necessary for vehicles operating in remote or border areas with poor connections.
The large antennas typically seen on Australian cars are often for CB (citizen's band) radio, which in Australia, runs on UHF, a much higher band than CB in the US. While a small 18 cm high quarter wave antenna can work well with UHF, some Australians opt for larger antennas for aesthetic reasons.
These large antennas can also be used for ham radio, which operates at a different frequency and may require additional antennas to avoid interference. The type of antenna mount used is also a consideration, with bumper mounts being a common choice for Australian cars.
Overall, the use of large antennas by Aussies is often a combination of practical communication needs and personal preferences, with some opting for larger sizes than technically necessary.
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Antennas are sometimes placed on bull bars
There are some drawbacks to placing antennas on bull bars. One issue is that the bull bar is not an ideal spot electrically, and a large counterpoise like the roof would be preferable. However, it is challenging to find enough space for an HF antenna on a car. Additionally, the flopping of the antenna back and forth can wear off the paint from the edge of the hood as the mount flexes.
Some users have reported issues with installing high-gain antennas on newer ARB bull bars due to interference with the collision braking camera. As a result, some have opted for alternative mounting locations, such as the roof or above the headlight, or have had to weld new fixing mounts to the bull bar.
Overall, while placing antennas on bull bars has its advantages in terms of solid mounting and convenience, there are also considerations regarding electrical performance, paint wear, and potential interference with other vehicle components.
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Frequently asked questions
Some Australian cars have large antennas for aesthetic reasons, while others have them for more practical reasons. For example, highway patrol cars operating in remote or border areas with poor connection are equipped with large, high-frequency radio antennas.
The large antennas on Australian cars serve various purposes, including high-frequency radio communication, citizen's band radio, police digital communication radio, and mobile data.
Yes, there are different types of antennas used on Australian cars, including UHF antennas, CB antennas, and ham radio antennas.
It depends on your country and the specific type of antenna you are interested in. Some antennas may be available globally, while others may be specific to the Australian market.
