1. #1
    Join Date
    Dec 1999
    Location
    Virginia Beach VA
    Posts
    8,091

    Choosing a CB Antenna

    Choosing a CB Antenna

    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:

    • Antennas should have their coil above the roof-line of the vehicle (coil location is discussed later in this article). For optimal performance, 2/3 of the antenna should be above the roof-line.
    • Antennas mounted higher on the vehicle tend to perform better
    • It’s critical that the antenna mount be well grounded to the vehicle chassis. If a grounding jumper is used to ground the mount, it should be as short as possible. If installing an antenna on an RV or a vehicle without a sufficient ground, please refer to the “No-Ground Plane Antennas” section of this article.
    • Single antennas (vs. dual co-phased antennas) tend to perform better when mounted near the center of the vehicle.


    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.

    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).

    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. Antennas from Firestick, Wilson and K-40 are all high-quality antennas we’re very comfortable recommending.

    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:

    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.

    • Pros: Generally the cheapest and most effective CB antenna type. It’s possible to mount top-loaded antennas lower on the vehicle as their coil (which resides at the antenna’s top) is more likely to remain above the roof-line.
    • Cons: Due to the thinner coil wire size, top-loaded CB antennas generally have lower watt capacity ratings. This generally isn’t an issue when using most CB radios as 99.9% of all antennas are able to handle the 4 watt transmission limitation of all stock CBs. The lower watt capacity of fiberglass antennas is only an issue for those using a modified CB or a more powerful HAM radio.
    • Popular Applications: Cars, trucks, tractor trailers and RVs. Top-loaded fiberglass antennas are generally the most versatile and popular CB antenna type.

    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.

    • Pros: Offers one of the simplest mounting and installation methods with the all-in-one models. Additionally, base-loaded models are able to utilize a thicker coil and generally have a higher watt capacity rating than top-loaded fiberglass CB antennas.
    • Cons: The least efficient type of antenna relative to other load positions. An antenna’s coil needs to be above the highest vehicle surface for optimal performance and this results in fewer effective mounting options for base-loaded CB antennas. The coil load may be placed below a vehicle’s highest surface, but performance will suffer.
    • Popular Applications: Car and pick-up truck roofs and trunks.

    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.

    • Pros: Center-loaded CB antennas offer a slightly higher coil load than base-loaded antennas and are more efficient. They also will usually have a higher watt capacity rating than top-loaded fiberglass antennas.
    • Cons: Less efficient than top-loaded fiberglass CB antennas.
    • Popular Applications: Large trucks and tractor trailers.

    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, a Wilson CB antenna, Firestick CB antenna and K-40 CB antenna are all high-quality antennas 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.
    Last edited by TerryMason; 06-06-2008 at 09:58 AM.

  2. #2

    Re: Choosing a CB Antenna

    Here is what mount I use for my antenna.Easy install and no holes to drill and it's out of the way of everything.I use the 102" whip is cheap and out preforms all the other antennas and don't have to worry about the s.w.r. just slap it on and go.Even when im out wheelen slapping all the tree's it's still standing tall. Choosing a CB Antenna-jeep-van-005.jpg

  3. #3
    Join Date
    Mar 2009
    Location
    lehigh valley,PA
    Posts
    16

    Re: Choosing a CB Antenna

    Thanks for the good (and much needed) antenna theory! It drives me crazy to see posts of people who are being given lousy advice on antennas. My favorite are the antennas that miraculously can be resonant on AM, FM, and 27- 30 Mhz! One thought on top load vs. center load: I have noticed that center load antennas are (by construction) much sturdier than top-loads, a consideration for off-roaders. JB

  4. #4

    Re: Choosing a CB Antenna

    I drive semi truck for a living durring the week. We love our cb's, but it seems like every radio shop will tell you something different. I have a Galaxy radio with a Francis antenna and a Texas start dx250. seems to work great, But no matter who I talk to, the COAX is always the big deal, Cheap wire will ruin you everytime. Get the kind that you can unscrew the ends and see if its soldered on or pressed on to the connection. Soldered is the best, Less chance of it comming apart and failing on you. I run 18' of wire never wound up for fear of "choke" But in a jeep , you shouldnt have that problem. my .02

  5. #5

    Re: Choosing a CB Antenna

    That's a great write up Terry.

    The only thing I would like to add to the "factors to consider" - what environment will you predominately be in? When I first put my radio in I went with the Fire Stick. I am in south Florida. Wheelin in the woods and swamps; navigating around and through a bunch of trees/brush. I lost a couple of Fire Sticks due to their rigid construction and some tree limbs. Getting tired of that result rapidly, I went with a cheaper top load with a high degree of flexibility and haven't lost one since. Just as a reference my radio is a Cobra 75XST
    93 Sahara. has some stuff... Want more stuff
    South Florida Jeep Club Treasurer
    http://www.sfjcforum.com
    http://www.stolenvalor.com
    http://www.standown.org
    http://www.woundedwarriorproject.org
    "Whether you like it or not, you better learn to love it! 'Cause it's the best thing going today! Whooooo!" - Ric Flair

  6. Re: Choosing a CB Antenna

    I mounted mine under the steering wheel to the right of. It's a thin unit and I can see the channels in between the spokes. My antenna is a fire stick.
    Nice setup from Cool Tech LLC. JK Ultamount CB Antenna System

    Choosing a CB Antenna-antenna2.jpg

    My 2012 Rubicon 2 door install

    Choosing a CB Antenna-jkantnprod02_640x480.jpg
    Last edited by TerryMason; 09-05-2012 at 10:17 PM.

  7. #7
    Join Date
    Aug 2012
    Location
    Milwaukee WI next to the lake
    Posts
    289

    Re: Choosing a CB Antenna

    A couple of tips: Fiberglass stick type antennas Must have a spring at the base if you run in the woods or under overhangs of anykind the springs are made for these antennas and will not adversely affect their performance. Also on a soft top jeep or a fiberglass/poly roofed jeep the ground plane is the height of the hood so mounting an antenna any higher than that is not going to improve performance. Next the coax. If it is RG58 throw it out. Replace it with RG-8x and DONT use cheap coax. Coax (feedline) is part of your antenna and the Best radio is turned to junk by a bad antenna system. Solder all coax connections crimped connections go bad from corrosion. Seal the connection at the antenna with some form of insulating waterproofing. Clear RTV Silicone is a good choice as is self vulcanizing rubber tape if it is properly applied, Liquid Electrical Tape is good but regular electrical tape is not. Remember to ground your antenna mount! dont just depend on the standard setup to gound it. Go the extra step to add the shortest ground strap possible. Also make sure your radio mount is grounded. This will ensure the best possible SWR you can get, the least amount of interference, and the best operation you can get. If you are receiving alternator whine on the radio go to your nearest truck stop and pick up a powerline filter from on their rack of radio supplies, if they have one labled "Brute Force" thats the one! Put it on the power inpit to the radio but NEVER put anything on your alternator. Modern alternators can be messed up by adding filters to them. They affect their regulators.

    I run multiple radios in my jeepsm Ham and CB, Ive run into many strange problems and these simple steps as well as what others have posted here will overcome them. Excellent And responsible Thread!

    AND Streak, I "Skywarn" on the west shores of Lake Michigan!

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