Custom CB Radios

07/23/2026

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07/23/2026

Long but a good read.
Higher loss, narrower bandwidth, and require
So, how does an antenna really work?

Core Overview

This guide explains how CB (Citizens Band) radio antennas work, covering their basic functions, electromagnetic principles, and practical tips for optimal performance.

What a CB Antenna Is Doing: A Transducer for RF Energy

* RF Signal Generation and Transmission: A CB radio transceiver generates an RF signal at approximately 27 MHz, which falls within the CB band (26.965–27.405 MHz). This signal is sent to the antenna via a 50-ohm coaxial cable. At the base of the antenna, the RF voltage and current move charges back and forth along the metal. As these charges accelerate, they create time-varying electric and magnetic fields. When these fields break away, they travel outward as electromagnetic waves at the speed of light.
* Reception Process: When receiving, the process works in reverse. An incoming radio wave induces a voltage and current in the antenna conductor, which is then transmitted down the coaxial cable to the receiver. The antenna is more than just a piece of metal—it is carefully sized and placed to handle RF currents and efficiently send and receive energy to and from the air.

Wavelength, Resonance, and Antenna Length

* Wavelength Calculation: At 27 MHz, the wavelength ($\lambda$) is calculated as $c/f \approx 300,000,000 / 27,000,000 \approx 11.1$ meters, which is approximately 36.4 feet.
* Resonant Lengths: Antennas are often made to be a fraction of this wavelength. A quarter-wave antenna is about 9.1 feet long, while a half-wave antenna is about 18.2 feet.
* Quarter-Wave Vertical Antennas: Most mobile CB antennas are quarter-wave verticals or shorter versions. This design is popular because a quarter-wave length gives a good current pattern, making the antenna efficient and easy to connect to the radio.
* Antenna Shortening and Loading Coils: Because a 9-foot rigid rod is too big and impractical for most vehicles, many antennas are made shorter (about 3 to 3–5 feet) and use a loading coil. The coil makes the antenna act like it is longer, so it can still work at 27 MHz.

Current Distribution: Where the “Work” Happens

* Current Distribution in Quarter-Wave Verticals: The antenna radiates. Radiation is where the current is strongest. In a quarter-wave vertical, the current is highest at the base and drops to almost zero at the tip. This means the lower part of the antenna is most important for how well it works.
* Loading Coils and Tradeoffs: Loading coils add inductance to offset the effects of a short antenna, allowing it to operate at 27 MHz. But coils also add resistance and losses. Shorter antennas with coils usually have higher loss, narrower bandwidth, and require more careful tuning. That’s why longer CB antennas usually work better—they lose less energy and cover more channels.

The “Other Half” of the Antenna: Ground Planes and Counterpoises

* Ground Reference Requirement: Every antenna system necessitates a return path for RF current. For vertical antennas, this return path is a ground reference. In vehicles, the metal body serves as the ground plane. For base stations, people use wires called radials or a ground-plane kit.
* Current Flow and Poor Return Paths: In a quarter-wave vertical antenna system, current flows up the whip and returns through the ground plane. If the return path is poor, RF can travel on the outside of the coax cable, which can mess up the signal pattern, increase noise, change SWR in odd ways, and cause interference in electronics.
* Importance of Solid Bonding: A strong, well-connected mount that is well connected with the vehicle body, sometimes supplemented with bonding straps between body panels, is important for making a stable, low-resistance return path.

Impedance and Matching: Why SWR Matters

* Antenna Impedance: A CB radio works best when it sees about 50 ohms of resistance at the end of the coaxial cable. Real antennas have both resistance and reactance, but at resonance, the reactance is close to zero, so the impedance is mostly resistance.
* SWR (Standing Wave Ratio): SWR measures the mismatch between the transmission line’s characteristic impedance (typically 50 Ω) and the antenna system impedance at the feedpoint. A mismatch causes some RF power to reflect back towards the radio, creating standing waves on the cable. A low SWR means most power goes to the antenna, but it does not always mean the antenna is efficient. An antenna can have a good SWR but still lose a lot of energy. Low SWR indicates good power transfer and minimal reflected power, but it does not guarantee high efficiency, as a highly lossy antenna can still be matched with an acceptable SWR while radiating poorly.
* Tuning and Matching Devices: To tune a CB antenna, you adjust its length (by trimming the whip or moving a set screw) so it works best near the center of the CB band. If the SWR is lower on channel 1 than on channel 40, the antenna is too long. If it is lower on channel 40, the antenna is too short. Matching devices can help match the antenna to 50 ohms, but they do not make a poor antenna work better—they just help send more power from the radio to the antenna.

Polarization and Radiation Pattern: Why Vertical Whips Are Common

* Vertical Polarization: Most mobile antennas use vertical polarization, meaning the electric field is up and down. This works well for antennas mounted on vehicles and gives steady communication over the ground.
* Radiation Pattern of Quarter-Wave Verticals: A quarter-wave vertical antenna over a good ground plane typically exhibits an omnidirectional pattern in the horizontal plane, allowing communication in all directions. It also features a low takeoff angle, which is beneficial for ground-wave and certain types of skip (ionospheric) propagation.
* Mounting Location Effects: The mounting location significantly impacts the radiation pattern. A center-mounted antenna on a metal roof generally provides a more symmetrical pattern, whereas bumper or fender mounts can skew the pattern and reduce the effective ground plane.

Coax, Common-Mode Current, and the Role of Chokes

* Coaxial Cable Function: Coaxial cable is designed to carry RF signals internally, with the signal on the center conductor and an equal and opposite return current in the shield. Ideally, the outside of the shield carries no RF current.
* Common-Mode Current: If the antenna system lacks an adequate counterpoise, RF can flow along the outside of the coaxial cable shield, a condition known as common-mode current. This effectively makes the coax part of the antenna, altering its tuning and radiation pattern, and potentially introducing RF into the vehicle cabin or radio room.
* Common-Mode Chokes: A common-mode choke, often a ferrite choke or a coiled section of coax, can be placed near the feedpoint to reduce unwanted shield currents, thereby ensuring more predictable antenna behavior.

Environment: Nearby Metal, Height, and Noise

* Environmental Interactions: CB antennas are highly sensitive to their surroundings. Nearby metal objects can detune the antenna by altering its capacitance and inductance. The antenna's height above ground and the presence of surrounding structures influence its takeoff angle and signal loss.
* Noise in Urban Areas: In urban environments, electrical noise can significantly degrade reception. Proper grounding and the use of common-mode chokes can help mitigate noise pickup.
* Mounting Location Impact: Even subtle differences in mounting location on a vehicle, such as on the trunk lid versus the roof, can significantly affect antenna performance by altering the effective ground plane and current return path.

Putting It Together: What Makes a CB Antenna “Work Well”

* Key Performance Factors: A high-performing CB antenna system is characterized by:
1. Adequate electrical length: Closer to a quarter-wave is generally preferred.
2. Low-loss design: Achieved through quality loading coils (if shortened) and sturdy conductors and connections.
3. Solid counterpoise/ground plane: Ensured by proper vehicle body bonding or base station radials.
4. Proper matching and resonance: Resulting in a reasonable SWR across the operational channels.
5. Controlled common-mode currents: Maintained through good feedpoint practices and, if necessary, the use of a choke.
6. Optimal placement: Clear of obstructions, positioned higher, and as centrally as possible.

Overall Conclusion

* Antenna Functionality: CB antennas operate by establishing RF currents within a conductor system that is sized and installed to resonate (or be matched) near 27 MHz. This setup enables these currents to efficiently launch a vertically polarized electromagnetic wave.
* Systemic Effectiveness: The effectiveness of a CB antenna extends beyond the whip itself, encompassing the entire system, including the ground plane/counterpoise, mounting and bonding, feedline behavior, and tuning.
* Achieving Optimal Performance: By addressing these interconnected components effectively, a seemingly simple CB whip can transform into a highly capable radiator and receiver.
* If you like this article, then please let me know, and I will produce mere of them for you all.
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Custom CB Radios

CB Repairguy

*

From radios to repairs — everything you need in one place

07/23/2026

What are some of the key things to do when setting your SWR on a CB antenna?

Your antenna plays a huge part in your radio system, as it dictates how effectively your signal is transmitted and received. When tuning your SWR, start by making sure your antenna is mounted in a clear, unobstructed location, ideally as high as possible on your vehicle. Next, verify that your antenna system has a solid ground connection, as poor grounding is a frequent cause for high SWR readings. Once mounted, use a calibrated SWR meter to test your readings across both the lowest and highest channels. If the SWR is higher on the lower channels, your antenna is likely too long and needs to be shortened. Alternatively, if the SWR is higher on the higher channels, your antenna is likely too short and needs to be lengthened. Make these adjustments in small, incremental steps—cutting only a fraction of an inch at a time or slightly extending the antenna element if the design allows. After each adjustment, retest the SWR across the entire band to ensure the readings trend toward your target range. Remember to keep the radio turned off while making physical adjustments to the antenna to prevent damage to the transmitter’s final output stage. Once you have achieved an acceptable SWR across your desired frequency range, secure all connections and tighten any locking nuts or set screws to ensure the element remains firmly in place.

In some cases, the truck is not properly grounded to the frame, which can make it difficult to set up your antenna. To address this, you may need to install a dedicated ground strap between the truck body and the chassis. On trucks with powder-coated mirrors, the ground between the truck door and the mirror mount is insufficient, leading to high SWR readings. If you suspect this is the case, you should run a separate braided ground strap from the mirror mount directly to the door frame or the inner door panel.

Lastly, if you're picking a new antenna, always use a metal antenna instead of a fiberglass whip, as metal antennas generally provide a more consistent radiation pattern and are often more durable in high-wind conditions or when navigating low-hanging branches.

Some of you already know this stuff, but for new people, this may help some of you out.

Remember us for your radio and antenna needs.

Custom CB Radios

CB repairguy.

07/22/2026

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07/18/2026

NEW from President is the President Walker IV CB radio.
This radio is truly amazing in that it is a full-featured radio that gives you the power you need and the features you want in a size that fits in the cubby in your truck.
60 Watt PEP swing from a CB radio (after tuning) is twice the power of a Cobra, and pair it with the Digi Mike, and you have sound like you’re running a very high-end radio for a fraction of the cost. The face now has a cool glow feature that lets you change the entire face color to match the lights inside your truck, with options for both night and day settings.
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07/03/2026

Stryker 447 HPC 2 In Stock NOW!
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06/13/2026

Got a few radios done and many more to go.

06/08/2026

NEW President Washington 10Meter Radio Now 100Watt PEP out of the box!

The Washington now offers 100 watts of PEP along with new innovative features including Automatic Power Management (APM), Automatic Relay, Voltage Protection, SWR Protection, Microphone Up/Down Activate/Deactivate, in addition to our gold standards: NRC (Noise Reduction Circuit), ASC, Automatic SWR, Scan Skip and much more…

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05/18/2026

Eagles have to eat too.

04/26/2026

Modulation: the hard truth…

On CB (Citizens Band) radios, “modulation” simply means how your voice (audio) is impressed onto the radio carrier. The “truth” is mostly about limits, tradeoffs, and a lot of myths.

1) What modulation is on CB
CB uses two main voice modes:
- **AM (Amplitude Modulation):** Your voice changes the *amplitude* (strength) of the carrier.
- **SSB (Single Sideband: USB/LSB):** A form of AM where the carrier and one sideband are suppressed; your voice becomes a shifted “sideband” signal. It’s more spectrum/power efficient.

(Some CBs also support **FM** your voice changes the *frequency*.)

2) “More modulation” is not always better
People often chase “100% modulation” (AM) or “swing” because it sounds louder. Reality:
- **AM:** Clean modulation tops out around **100%**.
- **Under-modulated**: sounds quiet/weak.
- **Over-modulated (>100%)**: causes **splatter/distortion**, makes you harder to understand, and interferes with adjacent channels.
- **SSB:** There isn’t a neat “100%” target. The goal is strong audio **without ALC/limiter abuse** and without flat-topping/clipping.

Loud ≠ clear. Intelligibility wins.

3) The common myths (and what’s true)
Myth: “Turning up the mic gain all the way gives the best range.”
**Truth:** Too much mic gain causes distortion/overmodulation. Range and readability usually worsen because the receiver can’t decode muddy audio effectively. Set the radio mic gain to a level that's comfortable for the people you're talking to.

Myth: “A ‘power mic’ adds watts.”
**Truth:** It doesn’t add transmitter RF power; it boosts audio drive. Used carefully, it can help, but it can also overdrive the radio and create splatter.

Myth: “More swing means more talk power.”
**Truth:** AM “swing” (PEP increase on voice peaks) can be normal, but chasing big swing often means:
- reduced carrier too far (harder to tune/less consistent),
- heavy distortion,
- and more interference.
Clean audio at normal power often outperforms distorted “big swing.”

Myth: “Clipping the limiter makes you louder and better.”
**Truth:** Clipping can make you seem louder up close, but it usually increases distortion and adjacent-channel interference. Many stations will hear you as harsh and wide.

4) Legal/technical reality (U.S. regulations)
- **AM CB:** 4 watts carrier (FCC limit).
- **SSB CB:** 12 watts PEP.

5) What good modulation looks like (practical)
For **AM**:
- Aim for clean audio that peaks near 100% without splatter.
- If you have a modulation meter/scope: avoid flat-topping and negative peak cutoff.
- Set mic gain so normal speech is strong; shouting shouldn’t make it distort. However, there is no reason to shout.

For **SSB**:
- Set mic gain so your voice drives the radio strongly but doesn’t constantly slam the ALC.
- Speak normally, closer to the mic; consistent mic technique matters more than raw gain.

6) The biggest factor people ignore: antenna system
If you want to be heard:
- A properly tuned antenna (low SWR, good ground plane, good coax, good mounting) usually helps far more than audio mods.
- Poor antennas waste power and create problems that no “modulation tweak” fixes.

7) How to check if your modulation is clean
- Ask multiple stations for **audio reports** (not just one).
- Monitor yourself on another receiver at a safe distance (or use a dummy load + monitor setup).
- Watch for complaints like “you’re wide,” “splattering,” “garbled,” “harsh,” “sounds like you’re in a tunnel.”
In conclusion, you can make a radio loud and seem to be doing a great job, but the fact is that most of the time you're wasting power and creating unnecessary heat that causes the radio to fail prematurely, and causes splatter and does not give you any more range, or if it does, you are sacrificing sound quality for what you're gaining in range. I suggest you do some real-world testing and make up your own mind as to what kind of radio station you want to run.
CBR
Custom CB Radios

From radios to repairs — everything you need in one place