Stu-Offroad navigation header graphic Advertise here

Click image for more information
Home Steering Electric Bumper/Tires Guards Drivetrain Axles/Shafts Suspension/Brakes Recover Body Other Trips Videos Reviews Guns RC

 

CB Antenna Selection Considerations

Having recently completed two CB radio reviews for the folks at Right Channel Radios, I've been exchanging comments and information with them as the reader feedback rolls in.  I get a fair amount of questions along the line of "Which antenna should I get?" and "I need a CB radio.  There are so many to pick from, which one do I want?".  Andrew, the sales manager at RCR, was good enough to pass along some information that I'm putting here on the site....it should help answer some of the questions that come along (and you don't have to wait for me to provide you with an answer). 

So....without any further delay, some things to kick around regarding CB antenna selection.

There are a large number of CB antennas on the market and it can be a daunting task selecting one. When choosing a CB antenna it’s important to consider the antenna’s mounting location, brand type, length, mount size, coil location and ground plane.

Mounting Location Considerations

Mounting location is a difficult topic to advise upon due to each individual’s unique circumstances and preferences. Antennas can be mounted a number of places including on a vehicle’s roof, mirror bars, hood channel, bumper and trunk. Each method has advantages and disadvantages and it’s up to each individual to weigh these relative to their own needs and preferences. There are a few general rules to keep in mind when considering CB mounting options:

 

While it’s not always possible to follow all the previous CB antenna mount suggestions, following as many as possible will result in better antenna performance.

Mount Size

It’s important that a mount be sturdy enough to support a selected antenna. While a small roof magnet mount would be well suited for a short 2’ fiberglass CB antenna, it would be a very poor choice for a heavy center-loaded 5’ long antenna (as the momentum of the antenna while driving would likely cause the magnet mount to come loose). When selecting a CB antenna, make sure the chosen mount will be able to provide adequately support.

Antenna Brand

We recommend picking a quality CB brand as the antenna is the most important determinant of system performance. A good quality fiberglass CB antenna can be purchased for around $20, so there’s really no reasons to scrimp on such an important system component. Antenna from Firestik, Wilson and K40 are all high-quality antennas we’re very comfortable recommending.

Length

Longer CB antennas work better than shorter antennas, so select the longest length that can be comfortably used. Accessories such as quick-disconnects are available that allow for fast and tool-free CB antenna removal when additional clearance is required (garage parking, drive-throughs, etc).

 

Antenna Types by Coil

CB antennas can generally be grouped into three categories by load position. An antenna’s load position refers to the location where the antenna wire is wound into a coil. The optimal antenna length for CB frequencies is 102” as this represents one quarter of a wavelength. However, mounting a 102” (8.5 foot) antenna to a vehicle is usually not an option.

To get around this problem, manufactures wrap coil tightly along the antenna body in order to compensate for the reduced antenna length. In other words, a longer length similar to that of the 102” whip is achieved on a shorter CB antenna by wrapping the antenna wire close together, forming a coil. While this isn’t nearly as efficient as using a regular 102” antenna, it allows for shorter and more practical CB antennas.

Antennas can be categorized based on their coil location:

Base-Loaded Antennas

As the name implies, base-loaded CB antennas have their coil located at the bottom of the antenna. Many all-in-one magnet mounted and roof antennas are base-loaded. An all-in-one antenna refers to a product that contains the antenna, mount and cable in a single unit.

Center-Loaded Antennas

These antennas have their coil located in the middle of the antenna. This description is slightly misleading as the coil is usually located near, but not at, the bottom of the CB antenna. Most center-loaded antennas utilize a thick stainless steel shaft that makes up the bottom 1/3 to 1/4 of the antenna. The coil sits above this shaft, usually in a plastic housing, and the remainder of the antenna consists of a long and thin steel whip. Many popular professional trucking CB antennas are center-loaded.

Top-Loaded Antennas

Top-loaded CB antennas tend to be made of fiberglass. While the coils of base and center loaded antennas are usually contained in a plastic housing, top loaded fiberglass antennas utilize a thin wire that is wrapped along the antenna’s exterior shaft and covered with a protective layer.

No-Ground Plane (NGP) Antennas

When installing a CB antenna on an RV, boat or any vehicle with no metal chassis, a no-ground plane CB antenna kit is required. A traditional CB antenna utilizes the metal chassis of a vehicle when transmitting the radio’s signal. Without a good ground plane, the antenna will provide extremely poor performance.

No-ground plane (NGP) CB antennas have the required ground counterpoise built in to the coax cable and allow for operation without an external ground. Traditional ground plane antennas tend to have a 15% to 20% stronger field strength than similar NGP antennas. Subsequently, it’s always preferable to use a traditional ground-based antenna if a good ground plane is available. NGP antennas come in kits that include a specially modified NGP coax and antenna and subsequently aren't interchangeable with standard ground-based equipment.

Summary

There are a number of factors to consider when purchasing a CB antenna. Regarding brands, Wilson CB antennas, Firestik CB antennas and K40 CB antennas are all high-quality products you can feel confident using. As long as all factors are properly considered, it’s a relatively simple process to select a CB antenna that will perform well for a given vehicle or environment.


© 2008 Right Channel Radios.

 

 

 

 

Home Steering Electric Bumper/Tires Guards Drivetrain Axles/Shafts Suspension/Brakes Recover Body Other Trips Videos Reviews Guns RC