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CB antenna work for radio???

Discussion in 'Audio & Video' started by blackwatertaco, Apr 23, 2010.

  1. Apr 23, 2010 at 3:42 PM

    blackwatertaco [OP] If you ain't stuck, You ain't tryin hard enough.

    Jan 11, 2010
    First Name:
    Alvin/Pasadena, Tx
    08 taco, 4x4 2.7 5spd.
    One fucked up diff. breather mod, 265/75/16 Destiny Dakota M/T Black gulf states rims BHLM Magnaflow 14" muffler with cut off tail pipe. 10" pioneer slim truck sub with JBL 600W amp. PROJECT BLACK OUT
    Somebody jacked my radio antenna, Ive tried an easy out ect to get the broken stud out of my antenna hole...No bueno.

    Well I just bought a CB with a 3' antenna. will that work for my stereo? And what would I need to buy to adapt it.
  2. Apr 23, 2010 at 3:44 PM

    07trd4x4 Well-Known Member

    Jun 7, 2009
    First Name:
    Truckee/Sacramento CA
  3. Apr 23, 2010 at 5:29 PM

    sooner07 1/2 man 1/2 amazing

    Feb 17, 2008
    First Name:
    A A Ron
    DFW, Texas
    Debadged 2008 Rugged Trail
    Always working on the stereo, painted the front skid plate black to match the truck, debadged , toy tech ultimate lift kit, light racing UCAs, ARB bumper Looking into a supercharger and new exhaust.
    Short answer no.

    Long answer, the antenna size is designed for the frequency that it is intended to receive. CB radio is on a lower frequency (longer wave length) than commercial radio. That is why they are so much longer than the typical radio antenna. That is also why stubby antennas don't typically work nearly as well as the stock radio antenna.
  4. Apr 23, 2010 at 5:33 PM


    May 18, 2008
    First Name:
    Vernon, NJ
    03 2500 Dodge Ram
    Cat-Back, weather techs, ipod and sisuis Old 04 Taco: 5100s At all 4 corners set at 2.5", Toyotec AAL, Gibson cat-back, Deck plate mod, 20% Tint on fronts, 10" Kicker Comp sub, Sirius radio, Bud Built Skid, Pro Comp 8069 Wheels
    They make a comdination CB and AM/FM antenna. I havent seen one in a while.
  5. Apr 28, 2010 at 4:57 PM

    ShaLor Well-Known Member

    Jan 8, 2010
    First Name:
    Burbank, CA
    07 4x4 Doublecab TRD Off Road
    Custom mud flap removal from rock on trail :), Tailgate Hose Clamp Mod, Cobra 75 wx st CB install, 19 more D-Rings in the bed, Satoshi Grill, Fog Lamp on any time mod. Relentless Fab CB antenna hood mount, LED bed lights, Demello Hybrid Sliders, Undercover Tonneau Cover, Lighted 4x4 switch
    Yes you can use a CB antenna for a Radio antenna.
    Here is what Firestick has to say about it.



    Compliments of Firestik® Antenna Company Technical Support Team

    Copyright © 1996 Firestik® Antenna Company
    Can you use one antenna for AM/FM and CB? Absolutely! But if you have even the lowest level of expectation as to how you want your CB to work, you need to shop wisely.

    Back in the late 70’s a couple of manufacturers decided that they would connect a little electronic device to their AM/FM antenna and sell it to people as a 3-way antenna. On the surface, that appeared to be a pretty good idea. You wouldn’t need another antenna and thieves wouldn’t be able to tell that you had a CB in your vehicle (CB’s were being ripped off at a horrific pace). Unfortunately, CB operation with the set up was a huge disappointment. The reason is clear (to us).

    The design of a "receive only" AM/FM antenna doesn’t really contain that much design at all. The biggest hurdles are the way you want/need it to mount on the vehicle, how tall you want it to be, and what do you want it to look like. If you scanned the antenna for primary and shadow resonant frequencies, you might have a hard time trying to find one that fell into either the AM or FM bands. Why? Because it just isn’t that important to "receive only" radios. As a matter of fact, if you broke the antenna off of your vehicle you would probably still receive the major stations in your area. Granted, it may not be as good as when you had the antenna but you could still use the radio. And, if you had a metal coat hanger you could twist up a workable antenna in a few minutes.

    Transmitting antennas (such as CB) are required to be resonant (design frequency that matches the radios output frequency) in order to operate. If they miss the mark somewhat you probably wouldn’t recognize the difference while in the receive mode. However, CB’s are also transmitters. In order for the antenna to absorb the radio’s energy it must be, within a fairly small bandwidth, on frequency with the radio. Failure to meet the transmitters needs means poor performance at least and damaged equipment at worst. Accordingly, in the 3-way antenna business, all design functions must first take into consideration the needs of the transmitters. Unless of course you don’t care how well the CB performed.

    When a CB antenna doesn’t resonate in the general frequency ranges of the transmitter, the energy that cannot be absorbed by the antenna is reflected back into the transmitter. High reflection results in highly heated components that will eventually fail. So what did the designers do? In order to protect the radios from going up in smoke they added a circuit in the antenna lead that would bleed away huge amounts of the radios power. What would you think of a tire business that sold you tires that would explode over 40 mph so they removed half of your spark plugs to control your speed? In effect, that is what WAS being done to the antennas in those 3-way set-ups.

    If you want a 3-way antenna, start with the CB antenna. Get a good one! Then pick-up a tunable 3-way splitter (like our AR-1A). First, tune the CB antenna without the splitter in line to establish a set of reference points. Next, put the splitter in-line (connected to the CB, the AM/FM radio and the antenna) and recheck the SWR. Make any fine adjustments for the CB antenna with the appropriate adjusting device on the splitter. And finally, tune in a local AM broadcast station in your area and tweak the AM adjustment on the splitter to get best reception.

    Finding an AM/FM look-a-like 3-way antenna today is a difficult task because the marketplace sent them packing after discovering the poor performance they deliver. However, if you end up with a disguise CB antenna, just don’t expect it to work very well. With your expectations set low, you won’t be too disappointed.
  6. Jul 21, 2010 at 10:01 AM

    BarefootBandit Well-Known Member

    Jul 12, 2010
    06 Double-Cab TRD Sport 6-Speed
    You technically can use the CB antenna for your AM/FM radio, because your radio only needs something metallic and outside the vehicle.

    You would need a "SO-239 to RCA male" adapter or whatever type of connector the Toyota radio has.

    Or you could buy a mag-mount or NMO mount VHF antenna, and stick it dead center on the roof of your truck. Just connect it to your radio. It would be A LOT smaller, and get better reception than your stock antenna ever could due to the ground-plane.

    You can also use your AM/FM antenna as a SCANNER antenna, like in this video.


    However, never for transmitting.

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