Boosting CB Radio Performance: 2 Antennas vs 1

Table of Contents

1. Introduction
2. Antennas: One vs Two
3. Factors to Consider
   • 3.1 Location
   • 3.2 Coaxial Cable
   • 3.3 Performance
4. Single Antenna System
   • 4.1 Radiating Pattern
   • 4.2 Coaxial Cable Length
5. Dual Antenna System
   • 5.1 Co-phased Antennas
   • 5.2 Radiation Pattern
   • 5.3 Coaxial Cable Setup
6. Pros and Cons
   • 6.1 Single Antenna Pros
   • 6.2 Dual Antenna Pros
   • 6.3 Single Antenna Cons
   • 6.4 Dual Antenna Cons
7. Conclusion

Antennas: One vs Two

Antennas play a crucial role in the performance of a CB radio system. It is a common question among CB enthusiasts whether to use one antenna or opt for the dual antenna setup. The choice between the two largely depends on various factors, including the location of use, type of coaxial cable, and desired performance. In this article, we will delve into the differences between single and dual antenna configurations to help you make an informed decision. So, let's dive in!

Factors to Consider

1. Location

The location where you most frequently use your CB radio system is a key consideration when deciding between one or two antennas. If you often find yourself driving in areas with long, straight, and flat roads like the desert, utilizing two antennas can significantly enhance your signal reach. On the other hand, if you frequently encounter hilly terrain or mountainous regions with curved roads, a single antenna may prove to be more advantageous.

2. Coaxial Cable

Another important aspect to keep in mind is the type of coaxial cable required for each antenna setup. With a single antenna, you will need to use 50-ohm RG58 coaxial cable. Conversely, a dual antenna setup necessitates the use of 75-ohm RG59 coaxial cable. It is crucial to select the appropriate coaxial cable to ensure optimal performance and compatibility with your chosen antenna configuration.

3. Performance

The performance of your CB radio system is directly impacted by the layout and setup of your antennas. For a single antenna system, the signal radiates evenly around the vehicle, much like the ripples in a pond after throwing a rock. This radiation pattern is achieved using 18 feet of coaxial cable, typically in three-foot increments. On the other hand, a dual antenna system, also known as co-phased antennas, requires the antennas to be spaced nine feet apart to achieve optimal performance. Although they can function at shorter distances, nine feet provides the best results.

Single Antenna System

Radiating Pattern

In a single antenna system, the signal radiates evenly from the antenna, covering a circular area around the vehicle. This front-to-back radiation pattern ensures efficient transmission and reception capabilities. The use of 50-ohm RG58 coaxial cable, alongside 18 feet in length, ensures proper signal flow without degradation.

Dual Antenna System

Co-phased Antennas

A dual antenna system, commonly referred to as co-phased antennas, involves mounting two antennas on your vehicle. These antennas are positioned side by side, with an optimal spacing of nine feet between them. The use of 75-ohm RG59 coaxial cable is necessary to achieve efficient signal transmission and reception in this configuration.

Radiation Pattern

In a dual antenna system, the radiation pattern is more focused to the front and back of the vehicle, rather than the sides. This front-to-back radiation pattern offers enhanced signal reach and clarity in the intended direction of travel. While some describe the pattern as oval-shaped, others liken it to a figure-eight. The precise pattern may vary depending on individual setups and factors such as antenna design and positioning.

Coaxial Cable Setup

When setting up a dual antenna system, it is crucial to avoid using a T-splitter or joint connection to connect the antennas to the radio. This setup results in decreased performance and high standing wave ratio (SWR). Instead, opt for a co-phasing harness or a splitter specifically designed for dual antenna configurations. These setups eliminate unnecessary joints and ensure optimal signal integrity.

Pros and Cons

Single Antenna Pros

• Simplicity of setup and installation
• Wide and even signal coverage
• Cost-effective solution
• Minimalistic appearance on the vehicle

Dual Antenna Pros

• Enhanced signal reach and reception, particularly in front and behind the vehicle
• Improved transmission range
• Reduced signal interference and noise
• Greater overall signal strength

Single Antenna Cons

• Limited signal reach and range, especially in hilly or mountainous regions
• Reduced performance compared to dual antenna systems
• Less focused transmission and reception capabilities

Dual Antenna Cons

• More complex setup and installation process
• Higher overall cost due to additional equipment and coaxial cable
• Occupies more space on the vehicle

Conclusion

The choice between a single antenna and a dual antenna system depends on several factors, including location, coaxial cable requirements, and desired performance. If you primarily drive on long, straight roads or in the desert, two antennas may provide extended signal reach. Conversely, if you frequently encounter hilly or mountainous terrain, a single antenna setup could be more suitable. It is important to consider the pros and cons of each configuration to determine the best solution for your specific needs. With the right setup, you can enjoy clear, reliable communication on your CB radio system.

Highlights

• Choosing between one or two antennas for your CB radio system.
• Factors to consider: location, coaxial cable type, and desired performance.
• Single antenna systems provide even signal coverage in circular radiating patterns.
• Dual antenna systems offer enhanced signal reach and clarity in front and behind the vehicle.
• Pros and cons of each configuration help decide the ideal setup for your needs.

FAQ

Q: Will using two antennas significantly improve my CB radio's range? A: The use of two antennas, when properly set up, can improve the range of a CB radio system in specific circumstances. In areas with long, straight, and flat roads, such as deserts, the dual antenna setup can enhance signal reach. However, in hilly or mountainous terrain, a single antenna may be more suitable.

Q: Are there any special considerations for the coaxial cable used in dual antenna setups? A: Yes, dual antenna systems require the use of 75-ohm RG59 coaxial cable, while single antenna systems utilize 50-ohm RG58 coaxial cable. It is essential to select the appropriate cable to ensure optimal performance and compatibility with your chosen antenna configuration.

Q: Can I use a T-splitter to connect my dual antennas to the radio? A: No, using a T-splitter or joint connection to connect dual antennas to the radio can result in decreased performance and high standing wave ratio (SWR). It is recommended to use a co-phasing harness or a splitter specifically designed for dual antenna setups to achieve optimal signal integrity.