Good communication starts with a good antenna. Whether you're on the road with your truck, camper, 4x4, tractor, or other vehicle, the right mobile 27MC antenna will help you get the most out of your transceiver. In this blog post, we'll discuss the best mobile 27MC antennas available today, including their key features. This way, you can choose the perfect antenna for your vehicle and situation.
What should you pay attention to when choosing a mobile 27MHz antenna?
- The type of vehicle you want to place an antenna on
- How you want to mount the antenna to your vehicle
- What length antenna can you install without any problems?
- The position of the antenna coil
- Antenna with or without spring
- The power of the antenna
- The gain of the antenna
It is also important to know which connection the antenna has and whether an antenna cable with connector is included so that you can get started right away.
Vehicle type
Does the vehicle have a metal, aluminum, or plastic surface? A standard 27MHz mobile antenna requires a metal surface for grounding. But if you have a vehicle with a plastic or aluminum body, such as a camper, tractor, etc., then you should choose a No Ground Plane (NGP) antenna.
Do you already have an existing antenna connection?
Do you have a car with an existing fixed antenna connection, or a truck with a factory-installed M6 or other antenna base? With a Deltron antenna base adapter, you can always create a suitable solution for a new antenna.
Position of a mobile 27MC antenna
Where do you want to place a mobile antenna on your vehicle? Besides the most common magnetic base mounts and fixed mounting options, you can also attach a mobile antenna to the edge of a trunk lid or fender, in or on the cargo bed, on the back of a spare tire holder on an off-road vehicle, to a side mirror, to a roof rack or roof rail, or anywhere else. Special antenna brackets are available for this purpose. You can read more about antenna positions in our blog post " The right position for your mobile antenna: smart mounting on your car ."
The length of a mobile 27MC antenna
Generally speaking, the longer the antenna, the better the range. Note: When purchasing, be sure not to install it under low passages, or choose a mobile antenna with a tilting system.
Base, center of topload mobile 27MHz antennas
The "load" refers to the antenna's coil; for some antennas, it's located at the bottom, top, or center. Base-loaded, center-loaded, or top-loaded antennas affect performance at different mounting heights.
- Base loading: The loading coil is located at the bottom, right next to the connection. This makes the antenna more compact, but with slightly less transmission efficiency.
- Center loading : The coil is located in the center of the antenna. This often results in a slightly more favorable radiation pattern than base loading, with better efficiency.
- Top loading: Here, a capacitively coupled element (e.g., a plate or wire element) is added at the top. This increases bandwidth and radiation resistance, particularly effective with shorter antennas.
What is a coil and why is it important in a 27MC antenna?
The position of the coil on an antenna refers to the point where the antenna wire is tightly wound into a coil. But what exactly does such a coil do, and why is it necessary?
Ideally, an antenna for the 27MHz frequencies would be 260cm (102 inches) long. This corresponds to a quarter wavelength, which ensures optimal performance. However, mounting such a long antenna on a vehicle is often impractical or simply impossible in practice.
That's why manufacturers choose to wrap the wire in a compact coil on the antenna's core. By doing this, they simulate the length of a 260cm (102-inch) antenna, but in a much shorter format. This coil is usually located at the bottom, center, or top of the antenna.
Note : The coil is the most active part of the antenna for transmitting and receiving signals. Therefore, when mounting the coil, make sure it extends above your vehicle's roofline. If this part remains hidden behind the roof, performance will be compromised.
Mobile antenna with or without spring
Some mobile 27MC antennas come standard with a spring; other models have an optional spring. The spring acts as a shock absorber and provides additional flexibility. This reduces the load on the antenna, base, and vehicle when hitting branches, low passages, or other obstacles. In addition, the spring dampens vibrations while driving, which improves signal stability and reduces wear and tear on the mounting. A spring also makes the antenna more resistant to unexpected shocks and movements, extending the life of both the antenna and the base.
The power of a mobile 27MC antenna
When choosing a CB antenna, it's important to consider the maximum power the antenna can handle—especially if you're using a linear amplifier. A helpful rule of thumb: always choose an antenna with a continuous power rating that's at least equal to, and preferably slightly higher than, your transceiver's transmit power.
Most standard 27MHz transmitters have a power rating of 4W AM/FM and 12W SSB (LSB/USB), but if you have a modified 27MHz transceiver with a transmit power of 10 watts, for example, then it needs an antenna capable of handling at least 10 watts continuously.
If you want to install a linear amplifier between your antenna and transceiver, pay close attention to your amplifier's maximum input power. Important to know: an antenna rated for 1000 watts continuously doesn't necessarily perform better than one rated for 100 watts. The antenna's position, length, alignment, and design often play a greater role than the maximum power alone.
The gain of a mobile 27MC antenna
Gain indicates how well an antenna focuses the transmitted or received signal in a specific direction, compared to a reference antenna (usually a theoretical isotropic antenna). Think of it like the beam of a flashlight: the narrower and more focused the beam, the further the light reaches. The higher the gain (for example, +3 dBi or +5 dBi), the better the antenna can focus energy efficiently, improving range and reception.
- When transmitting: The better the antenna converts the electrical power into radio waves that are emitted in a targeted manner.
- When receiving: The better the antenna converts incoming radio waves into electrical signals, directed in the desired direction.
What are No Ground Plane (NGP) antennas?
Standard mobile antennas require a metal surface (ground) to perform well. This ensures that the antenna system radiates correctly and provides sufficient signal strength. Vehicles with plastic or fiberglass bodies (such as RVs, boats, motorcycles, or modern utility vehicles) often lack this metal surface entirely. This is where NGP antennas come into play.
How does an NGP antenna work?
With an NGP antenna, the shielding (outer sheath) of the coaxial cable is cleverly used as a counterpoise. This coaxial cable is specially designed and precisely matched to the correct length to electrically compensate for the lack of a metal ground plane. This allows the antenna to resonate correctly and create a good radiation pattern. The advantages of NGP antennas:
- Flexible installation: Suitable for vehicles with plastic or fibreglass bodies.
- Less susceptible to interference: The controlled radiation pattern helps reduce unwanted reflections and interference from nearby objects.
- Easier installation : Usually supplied complete with cable in the correct length.
Easy installation thanks to the smart FME connector
The FME connector on a mobile antenna is always More popular because of its ease of use. This connector is almost the same diameter as an RG58 antenna cable, making it easy to pull through tight openings, hollow spaces, or existing cable ducts in the vehicle. This makes running the cable from the antenna to the transceiver much easier and neater. Moreover, no soldering is required: simply screw an adapter onto the FME-Female connector, for example, from FME-Male to UHF-Male (PL-259), available in straight and angled models, allowing you to connect the antenna cable directly to your 27MC transceiver. This saves time, prevents errors, and ensures a clean, reliable installation.
Choose the antenna configuration that suits your situation
At Deltron, you'll find a wide range of mobile 27MC antennas, both with and without coaxial cables and/or connectors. Some models come complete with a pre-terminated RG58 coaxial cable and connector (often FME or PL-259), so you're ready for immediate installation. Other antennas are supplied without cables and connectors, allowing you to choose your own cable length, quality, and connections, or reuse existing wiring. This provides maximum flexibility: from simple plug-and-play installations to customized solutions for professional use.
In addition, you can also order ready-made coaxial cables with pre-terminated connectors from Deltron, so you can easily and reliably connect your antenna to your 27MHz transceiver.
Deltron's selection of mobile 27MC antennas in random order and design
President Maryland
- Length: 155 cm
- Base-loaded
- Power: 500 Watt PEP
- Gain: +5 dBi
- Suitable for fixed mounting (N-mount)
- Top for high power, durable and lightweight
President of Hawaii / Hawaii S
- Length: 72 - 79 cm (depending on model)
- Center-loaded (1/2 wave)
- Power: 150-250 Watt PEP
- Gain: +3 dBi
- Suitable for vehicles with limited height
Wilson 1000
- Length: approx. 163 cm
- Base-loaded
- Power: 3000 Watt ICAS
- Gain: Very well tested in lab conditions
- Available with magnetic base or fixed mounting
- Removable spool for garage/washing
Wilson 5000
- Length: 175 cm
- Base-loaded
- Power: 5000 Watts AM / 20,000 Watts SSB
- Very robust construction, silver-plated coil
- Removable coil for easy storage
Sirtel Santiago 1200
- Length: 191 cm
- Base-loaded
- Power: 1200 Watts RMS
- Gain: 6.5 dB
- Including antenna cable
- Very wide frequency range and high gain
Sirio Performer P2000
- Length: 192 cm
- Base-loaded
- Power: 2000 Watts
- Removable antenna
- 90° tiltable
- Very suitable for professional daily use
Sirio Performer 5000 or Turbo 5000
- Length: 196.5 cm
- Base-loaded
- Power: 5000 Watt CW (short) / 1500 Watt CW (continuous)
- Gain: High, omnidirectional
- Robust, stable, ideal for trucks and intensive use
KPO Omega 27 NGP
- Length: 95 cm
- Base-loaded (NGP)
- Power: 150 Watts peak power
- Gain: Suitable for vehicles without metal mass
- Including cable and mounting
KPO T3 NGP
- Length: 62 cm
- Base-loaded (NGP)
- Power: 100 Watts peak
- Lightweight, compact and ideal for campers/caravans
Sirio T4 27 FME
- Length: 73.5 cm
- Logarithmically loaded
- Power: 100 Watts
- Including FME connector for compact mounting
Sirio New Delta 27-M-95 FME
- Length: 95 cm
- Base-loaded
- Power: 100 Watts peak power
- Including cable and FME connector
Sirio Turbo 1000
- Length: 115 cm
- Base-loaded
- Power: 1000 Watt (short), 200 Watt (continuous)
- Removable boom, tiltable
Sirio Turbo 2000 or Performer 2000
- Length: 145 cm
- Base-loaded
- Power: 1000 Watt (short), 200 Watt (continuous)
- Removable, tiltable and ideal for long distances
Sirio T4 27 MAG
- Length: 73.5 cm
- Logarithmically loaded
- Power: 100 Watts peak power
- Magnetic mounting for quick and flexible use
Sirio GL-27 (NGP)
- Length: 115 cm
- Base loaded
- Tiltable
- Pre-tuned: no adjustment required
- Power: 15 Watts continuous and 50 Watts peak power
- Fixed mounting (through an opening) + mirror mounting bracket
Firestik FG2-648 NGP
- Length: 62 cm (installation height incl. spring approx. 74 cm)
- Type: 5/8 wave, No Ground Plane (NGP)
- Power: Max. 100 Watts
- Multi-wire coax technology (extremely interference-resistant and durable)
Mounting on magnetic base or fixed antenna base
The above-mentioned antennas are available with various connectors, such as a PL connector, which can be mounted on a magnetic base with a PL (SO239) connector, or on a fixed antenna base with a PL connector. Mobile antennas are also available with a DV connector, 3/8x24, and M6.
Conclusion
There's no single best antenna for everyone. Your vehicle, usage, and needs determine the right choice. Want maximum performance for long distances? Then the Sirio Performer 5000 or Wilson 5000 are excellent candidates. Looking for something compact for your camper or plastic roof? Then the NGP antennas are your solution.
If you're unsure, we're happy to advise you, so you can be sure you choose the right antenna for your situation. After all, good communication is not only convenient, but also safer and much more enjoyable!
Frequently asked questions about mobile 27MC antennas
What exactly is a 27MC antenna?
A 27MC antenna is a transmitting and receiving antenna that operates on the 27 megahertz (MHz) band, also known as the CB band. It is widely used for communication between vehicles such as trucks, campers, 4x4s, and tractors.
Which mobile 27MC antenna is best for my vehicle?
That depends on your vehicle type, the available mounting location, and whether your vehicle has a metal base. For RVs or plastic vehicles, NGP antennas are often the best choice. For trucks and 4x4s with metal roofs, high-power, base-loaded antennas are ideal.
What is an NGP antenna and when do I need one?
NGP stands for "No Ground Plane." These antennas are specifically designed for vehicles without a metal mass, such as RVs, boats, or utility vehicles with plastic or aluminum bodies. They operate without the need for a metal ground plane.
What should I pay attention to when mounting a 27MC antenna?
Consider the mounting position, antenna length, mounting type (e.g. magnetic base, fixed base, bracket), and ensure the coil extends above the roof for optimal performance.
How important is the coil position of an antenna?
Very important. The coil is the active part of the antenna. It should preferably be placed above the roof. Base-loaded coils are more compact, but less efficient than center- or top-loaded antennas.
What does 'gain' mean on an antenna?
Gain indicates how efficiently an antenna transmits and receives radio signals. The higher the gain (e.g., +5 dBi), the better the range. Make sure the antenna is properly tuned to your situation.
Can I install a 27MC antenna myself?
Yes, absolutely! Many models come with a cable and connector. Thanks to FME connectors, installation is easy and requires no soldering. If you have any questions, please feel free to contact us for advice.
What is the advantage of a spring antenna?
A spring acts as a shock absorber. It protects your antenna from damage when crossing low passages or branches and reduces vibration while driving. This extends the life of your antenna.
How long should a good mobile 27MC antenna be?
The longer the antenna, the better the range. An antenna of about 1.5 to 2 meters generally offers excellent performance. However, be aware of height restrictions, for example, in parking garages.
