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CB Antenna in Factory Antenna Location

Discussion in '2nd Gen. Tacomas (2005-2015)' started by hoverlover, Apr 2, 2018.

  1. Apr 2, 2018 at 1:17 AM
    #1
    hoverlover

    hoverlover [OP] "Shimmy Hendrix"

    Joined:
    Apr 4, 2016
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    #183342
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    10,649
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    C-137, Laniakea, Virgo, Milky Way, Earth, USA, TX
    Vehicle:
    stacked cases & 37's
    Mostly Zip-Ties
    Update: Before any tuning I was getting 3-3.5:1 SWR before any running in the 2' antenna. The mount has held up well, honestly a lot better than I expected. I've trucked right on through small tree limbs and brush and the antenna either bent out pushed it out of the way without moving the base or the mount.

    Mandatory CYA: Should you continue to read this, or attempt this modification, you do so at your own risk to yourself and your vehicle knowing and accepting that I cannot and will not be held liable for any injuries or damages.

    On to the mod!

    My factory antenna mount has wobbled since the day I bought the truck. It's always annoyed me and I've always wanted to get in there and fix it. Recently I snapped off my antenna at the stud and decided I'd do something different. I've had a multiplexor on my XJ for years and it gets excellent AM/FM reception and the CB communicates as far as I need it to. I'll admit, it's only a few miles, but that's more than I need and I am perfectly happy with that. I figured I also have been wanting to add a CB to my truck so I may as well give this idea a go.

    I've had a lot of interest about my CB antenna in the factory antenna location and have had a bunch of requests to do a write-up. This is my first formal how-to. Here goes.

    1017A0D3-2D14-4A8F-9261-5529DF037EC4.jpg

    Parts required:

    RP-315 CB Antenna Mount
    07D57AB6-C399-469E-B90A-7921F3C9679C.jpg

    Wilson 10" Stainless Steel Shaft
    9D171F5A-3EFC-4EB8-9043-9812208A7E11.jpg

    Wilson 305-610 Heavy Duty Antenna Stud
    89FD48CE-A53B-483C-9B48-BD23ACE9FD89.jpg

    ProComm Im-AF Splitter (Inverse Multiplexor)
    40001ED7-0419-43A9-A7F2-BFED89296882.jpg

    At least M6x50mm bolts x 2, washers, nylon locking nuts, etc.

    Tap and die set.

    3' Male/female AM/FM antenna extension cord.

    1" heavy steel bushings or similar.

    CF635EA5-5CEA-47A3-B236-86D8EEF537B2.jpg

    D4036420-6166-4F40-A664-ABA27B239C92.jpg

    9' (or your choice of length) Antenna Cable - 9' for center console mounting.

    CB of your choosing.

    Antenna of your choosing (I used a 2' FireStick FS II)

    First, pull the fender liner on the passenger side and the flare (yes, pull the flare, it'll make life easier later). You don't have to remove the liner, I just popped the back side out enough to access the antenna base.

    E790796E-7215-47D5-B4E0-34B6ECC09AC9.jpg

    3A7763C3-67C2-4003-A47E-305EC20230D8.jpg

    Remove the antenna and the silver ring at the base of the antenna. Mine was corroded and had to be cut off with a dremel. If yours is the same, pull the rubber protector off (save it for later!) and go to town. I cut the ring vertically in three or four places and worked it free. It's alright if you cut a little into the base, the rubber protector you should have already removed will hide any cuts.

    Once the top section of the antenna has been removed, remove the (I believe) 10mm bolt behind the fender liner holding the mast in place. You should also see the factory antenna wire routed through a large grommet. Once you have the mast free, pull the grommet out too. I simply cut the factory antenna wire near the mast and pulled it through the grommet. Hang on to that grommet, you'll reuse it too.

    Once you have liberated the mast and lower antenna mount, which is attached to the mast, you'll need to remove the factory antenna wire that is attached to its base. A dremel with a cut off wheel makes short work out this. You'll also need to separate the antenna base from the mast. I used a hand saw with a new blade and cut directly below the base where it meets the mast.

    1C1CE38B-0801-40E1-8973-8117CF60C2C7.jpg

    7505F92A-FA4A-41D6-A18A-1CD50F982535.jpg

    Since we're cutting things with our shiny new blade. Cut the lower portion of the antenna mount off too. I cut just below the top two bolt holes and just above where it bulges out to clamp on things. Do the same for the other piece, it'll act as support on the inner fender later. You'll have to take apart the antenna base attached to take the mount apart, don't worry about reassembling it. We'll come back to that.

    A96A7CED-CD39-441E-A69E-D0306FA6C8B1.jpg

    Now, with a 3/8 drill bit (if I remember correctly it was a 3/8) or one that fits best, clean out the sheilding and the remaining wire inside the lower antenna base.

    7D777A97-C414-4196-BE40-70E55946BCF3.jpg

    I cleaned the corrosion off of the upper and lower antenna bases and painted them as well.

    Assemble the heavy duty stud, the 10" stainless steel rod, and the antenna mount like so.

    B109EF8A-95C6-44F6-BBDC-961B7FFCF546.jpg

    Note that the antenna mount LOWERS the antenna slightly.

    Using your die set, find the size that matches the threads on the extension rod and add another 1" or so more threads. I'm sorry, I do not recall what size the die was. Thread a nylon locking nut to the bottom of the new threads, then the factory lower antenna mount and feed it up into position. From here I got the lower mount into it's normal position in the fender and put the factory upper antenna base on the extension rod. I mounted the CB antenna to gauge where I should mount the CB antenna base inside the fender. I found, inside the fender, the perfect place for me.

    You can see in this picture again, with the 1" spacers, the base lines up perfectly with the factory antenna hole and with a good flat area to support the antenna base as well.

    B109EF8A-95C6-44F6-BBDC-961B7FFCF546.jpg

    Now the fun part. You'll either need a long drill bit or you'll have to get really creative. I, luckily, had a long bit. On the outside of the fender, if you're facing it from the side of the truck, remove the fourth little clip from the bottom up.

    F3874609-9C35-4D83-88C4-30B49B5FE37B.jpg

    This next image is taken looking through the hole that body clip fits into.

    E3CFC1BA-6C43-4455-B127-6327668230AA.jpg

    After you have your antenna mocked up, ensuring it is not leaning to far fore, aft, port, or starboard, mark the holes in the base on the inner fender.
    DON'T DRILL YET.

    Inside the cab, remove the trim from the right side of the passenger floorboard area.

    086ED516-1084-4777-9185-B843022F8F0F.jpg

    Remove the top 10mm bolt holding all those wires in place and move them aside. I only had to pull that top bolt. It is bolted to the fender you're about to drill through. Pull the little tab out securing the carpet.

    CFDF8674-71AE-4336-A26A-0B6DC93FF770.jpg

    Pull the carpet to the side. It doesn't have to be much. Measure up from the grommet hole inside and outside where your new body piercings are going. Verify you won't penetrate anything critical or otherwise. Also, it's not a bad idea to disconnect your battery at this point.

    Once you are certain, run your drill through the body clip hole in the outer fender to your marks on the inner fender. Take care not to bump the sides of the hole. No big deal if you do. You won't see it if you still use flares, but the body clip might be a bit loose.

    I added a bit of paint to the new holes to prevent corrosion and a ton of clear silicon to prevent leaks. You really can't use enough. Use the back side of the antenna mount that you cut earlier on the inside of the cab to help spread and support the load. Mount your antenna base with the 1" bushings like so.

    D311C7D2-7770-4EB3-B518-BB3B563F834E.jpg

    (I thought I used enough silicone sealant but had a minor leak during a heavy storm a few days later. I went back in and sealed some more and after washing the truck yesterday didn't have any further leaks.)

    I then shoved the CB antenna wire through the grommet, sealed it with more silicon, and ran the wire under my center console where I found a place to mount the multiplexor with an existing bolt and bolt hole. I had to use an antenna extension to reach my stereo.

    DAD0B713-C29F-4CA2-9E39-9E005CAA5CF1.jpg

    I also trimmed one side of a 3/8 grommet and used it to give the factory antenna base a more finished look.

    EECB6156-5AEA-4C84-BE9E-92EEB4B8268C.jpg

    C141252F-B78D-42DD-8A4B-3104DAE34FBB.jpg

    Once you get everything plumbed in the way you like it, go back and tighten the heavy duty stud, the antenna, and the nylon locking nut on the shaft. Verify all other fasteners are nice and tight.

    BEBE77DF-DD5D-40EA-B429-C66B3DAF953E.jpg

    Account for your tools, replace the fender liner, the flare, and the interior trim. Reconnect your battery and tune in a radio station. If you have a CB, continue the install.

    That concludes the antenna portion of this install. I'm sure I'll make some tweaks here and there as time passes.

    If you guys have any questions or concerns, please shoot me a PM. I will update this thread from time to time with updates and pictures. Once I figure out which CB will fit my needs best I'll update with the SWR and if I needed to make any major adjustments.

    Thanks for taking the time to read this!

    -HL

    8B6CB3C3-CFEC-4C94-85B1-17C44FC5034D.jpg

    E1B75057-3339-4B73-9990-8393548B9998.jpg

    64C27BF7-C4CB-43F1-B57B-102E62488DEF.jpg
     

    Attached Files:

    Last edited: May 19, 2020
    tony2018, Slashaar, SR-71A and 15 others like this.
  2. Apr 2, 2018 at 1:17 AM
    #2
    hoverlover

    hoverlover [OP] "Shimmy Hendrix"

    Joined:
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    C-137, Laniakea, Virgo, Milky Way, Earth, USA, TX
    Vehicle:
    stacked cases & 37's
    Mostly Zip-Ties
  3. Apr 2, 2018 at 1:32 AM
    #3
    EatSleepTacos

    EatSleepTacos Well-Known Member

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    Pretty damn slick. Good job OP.
     
    Slashaar and hoverlover [OP] like this.
  4. Apr 2, 2018 at 3:07 AM
    #4
    LostHusker

    LostHusker Just one day at a time

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    Looks good man :thumbsup:
     
    hoverlover [OP] likes this.
  5. Apr 2, 2018 at 3:16 AM
    #5
    BamaTaco56

    BamaTaco56 Well-Known Member

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    Thanks for the write up!
     
    hoverlover [OP] likes this.
  6. Apr 2, 2018 at 3:19 AM
    #6
    Fuelman

    Fuelman Well-Known Member

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    Mike
    Winchester VA
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    Ultraguage
    I see no reason you can’t get good SWR only drawback I see is the ground plane being weak to the right IE optimal location being center of vehicle.
     
    hoverlover [OP] likes this.
  7. Apr 2, 2018 at 5:22 AM
    #7
    Blais03

    Blais03 Guess I'll bring a spare wheel bearing...

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    Nick
    Easthampton MA
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    I really like this. Thank you for keeping me updated and tagging me.

    Does it still work as your AM/FM radio antenna too or only CB?
     
    hoverlover [OP] likes this.
  8. Apr 2, 2018 at 6:51 AM
    #8
    hoverlover

    hoverlover [OP] "Shimmy Hendrix"

    Joined:
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    C-137, Laniakea, Virgo, Milky Way, Earth, USA, TX
    Vehicle:
    stacked cases & 37's
    Mostly Zip-Ties
    No problem!

    With the multiplexor, the CB antenna doubles as an AM/FM antenna. Typically, the CB antenna will improve your radio reception as well. But it comes at a cost; you will sacrifice some CB performance and you cannot use the CB and your AM/FM radio simultaneously. I usually use a Bluetooth connection and I never need to communicate more than a few miles, so I am perfectly OK with the small sacrifice.
     
    Blais03 likes this.
  9. Apr 2, 2018 at 6:53 AM
    #9
    ChadsPride

    ChadsPride Tacoma Owner & Enthusiast

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    Nice work Alex! :headbang:
     
    hoverlover [OP] likes this.
  10. Apr 2, 2018 at 7:06 AM
    #10
    Blais03

    Blais03 Guess I'll bring a spare wheel bearing...

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    This is awesome. If i ever get a CB, this is certainly how ill be doing it.
     
    hoverlover [OP] and ChadsPride like this.
  11. Oct 29, 2018 at 5:53 AM
    #11
    Blais03

    Blais03 Guess I'll bring a spare wheel bearing...

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    Still thinking I might do this. any issues now that youve had it for a little while?
     
  12. Oct 29, 2018 at 7:02 AM
    #12
    hoverlover

    hoverlover [OP] "Shimmy Hendrix"

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    C-137, Laniakea, Virgo, Milky Way, Earth, USA, TX
    Vehicle:
    stacked cases & 37's
    Mostly Zip-Ties
    No, none so far and I've gone through some thick brush that bent the antenna back quite a bit. It's as sturdy as ever.
     
    Blais03 likes this.
  13. Oct 29, 2018 at 7:35 AM
    #13
    MolonLabeTaco

    MolonLabeTaco Well-Known Member

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    That’s pretty much what we did with our FZJ80’s. There’s actually an already made kit that would cut out 90% of the fab work. It’s made for the 80 but I don’t see why it wouldn’t work for our Taco’s.
     
    hoverlover [OP] likes this.
  14. Oct 29, 2018 at 7:47 AM
    #14
    hoverlover

    hoverlover [OP] "Shimmy Hendrix"

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    C-137, Laniakea, Virgo, Milky Way, Earth, USA, TX
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    Mostly Zip-Ties
    I got the idea from an FJ, got a link to the kit?
     
    Blais03 likes this.
  15. Oct 29, 2018 at 7:58 AM
    #15
    MolonLabeTaco

    MolonLabeTaco Well-Known Member

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    KTM753 and hoverlover [OP] like this.
  16. Oct 29, 2018 at 9:49 AM
    #16
    hoverlover

    hoverlover [OP] "Shimmy Hendrix"

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    Mostly Zip-Ties
    MolonLabeTaco likes this.
  17. Oct 29, 2018 at 10:25 AM
    #17
    llamasmurf

    llamasmurf Herpa Derp

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    Build thread lists all the things :D
    I was a little to lazy for all that lol. Left the stock antenna and put the firestick on with it, had to modify the mount a bit for my needs. Held up great this summer in the bush, spring on the bottom gives it plenty of bendy.



    :cookiemonster:

    That the look of yours with only 1 antenna though o_O :thumbsup:
     
    hoverlover [OP] likes this.
  18. Mar 19, 2019 at 6:16 PM
    #18
    hoverlover

    hoverlover [OP] "Shimmy Hendrix"

    Joined:
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    C-137, Laniakea, Virgo, Milky Way, Earth, USA, TX
    Vehicle:
    stacked cases & 37's
    Mostly Zip-Ties
    After a few extensive wiring projects...

    732D65A7-D213-4141-B247-58D6515850A7.jpg E984E110-5949-4E29-9FDF-EAE951C5EAE5.jpg F8059BA0-23AA-4639-8920-A70341E6C3D7.jpg

    I haven't exactly had the motivation to install the CB that's been collecting dust in my garage. Since I'll be tearing everything apart again in a few days for the FJ transfer case, ADD delete/override switch, equalizer, and some other miscellaneous electrical projects I will take some time to install the CB as well and complete this project.

    Stay tuned.

    Pun intended :wink:
     
    BassAckwards, llamasmurf and Blais03 like this.
  19. Mar 19, 2019 at 8:43 PM
    #19
    apoteker

    apoteker Well-Known Member

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    Nice work
     
    hoverlover [OP] likes this.
  20. Mar 19, 2019 at 10:12 PM
    #20
    hoverlover

    hoverlover [OP] "Shimmy Hendrix"

    Joined:
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    C-137, Laniakea, Virgo, Milky Way, Earth, USA, TX
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    stacked cases & 37's
    Mostly Zip-Ties
    Thank you!
     

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