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CB Antenna Placement

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04 Mar 2020 10:41 - 04 Mar 2020 11:42 #219366 by furo
CB Antenna Placement was created by furo
Hi folks,

I have just installed a CB in my Jimny and I am trying to work out the best location for the antenna. I thought I could attach it to my roof rack (yellow arrow) and run the wire through the aerial mount and down the A pillar, but I wasn't sure if I'd get interference from the radio aerial/cable and if the roofrack would be a suitable ground. I have read quite a lot of conflicting information.

EDIT: I have also thought about directly replacing the radio aerial with an antenna, and going without a radio.

Thanks!


2004 Jimny Mode: General Grabber AT3s (215/75/R15); Trailmaster 2" Lift; Jimnybits Snorkel; Jimnybits Front and Rear Recovery Points; Suntop Roof Rack; AVM Manual Hubs; Albrecht CB; Stainless Steel Exhaust System.
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Last edit: 04 Mar 2020 11:42 by furo.

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04 Mar 2020 14:36 #219373 by gusthegorilla
Replied by gusthegorilla on topic CB Antenna Placement
Get something like this from eBay, and your CB aerial will perform both functions.....AND they do work !!

He who fails to plan....plans to fail !
I'm planning to live forever.....so far, so good !!
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04 Mar 2020 15:01 #219376 by DrRobin
Replied by DrRobin on topic CB Antenna Placement
The middle of the roof would be best. However, on the roof rack will be fine if there is a good earth. I buy self adhesive copper tape (slug barrier tape), this is very condutive, remove some paint from the roof rack and under the fixings and tape over for a really good earth. Seal it up afterwards with some electrical or self amalgamating tape.

Mag mounts work really well, even though they don't have a direct electrical connection to the roof, they are in close contact to still get the roof working as a good ground plane.

2011 Blue Jimny SZ3, Xtrons Head Unit, DAB, Front and Rear Cameras, TPMS, K&N, Bosch Aerotwin blades, LED side and interior lights, boot light, parcel shelf. Osram Nightbreakers
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04 Mar 2020 17:49 - 04 Mar 2020 17:52 #219381 by Max Headroom
Replied by Max Headroom on topic CB Antenna Placement
I'd second Gus' solution - it's a long time since I had a CB radio but I had a similar device which worked well.
I've also used mag-mounts very successfuly - my only question would be could a mag-mount get knocked off by tree branches etc - I know the mag moounts are very strong, but could imagine this happening


IF IT AINT BROKE, KEEP FIXING IT UNTIL IT IS
Last edit: 04 Mar 2020 17:52 by Max Headroom.
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04 Mar 2020 18:02 #219385 by yakuza
Replied by yakuza on topic CB Antenna Placement
Mag mounts fall off from branches. So much I do not bother with it anymore. But they work fine otherwise. When installing antenna directly on the roof metal it is best to have 20cm of plane metal around if possible.

2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
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04 Mar 2020 20:07 - 04 Mar 2020 20:11 #219389 by furo
Replied by furo on topic CB Antenna Placement
Thank you very much for your replies, that is very helpful.

Gus: that looks great, I think I'll get one of those!

One further question: the current aerial doesn't appear to have a ground, will I need to create one? I could connect a wire from the aerial to the bolt that secures the mount to the car (yellow line). Unless that is already built in?


2004 Jimny Mode: General Grabber AT3s (215/75/R15); Trailmaster 2" Lift; Jimnybits Snorkel; Jimnybits Front and Rear Recovery Points; Suntop Roof Rack; AVM Manual Hubs; Albrecht CB; Stainless Steel Exhaust System.
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Last edit: 04 Mar 2020 20:11 by furo.
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05 Mar 2020 06:03 #219401 by Reisher
Replied by Reisher on topic CB Antenna Placement
Hey you bought this aerial from me so I'll try to help.
This aerial does have ground its located in one of the washers you can see from the top the one that has a wire running to it that you marked yellow in your picture.
You need to make sure that this washer is in place. This ground is running from your car's frame to the coax isolation all the way to your head unit geound shielding the signal wire from interference.
The signal wire is running through the antenna itself to the middle wire in the cable to your head unit.
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05 Mar 2020 06:48 #219402 by kirkynut
Replied by kirkynut on topic CB Antenna Placement
I run one of these with my FM car radio and CB with the aerial on the roof of my external roll cage. Your roof rack will be a great groundplane:

www.thunderpole.co.uk/switches-filters/d...ntenna-splitter.html

It's just how to run the lead into the car.

Kirkynut

The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.

My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0
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05 Mar 2020 22:49 #219449 by furo
Replied by furo on topic CB Antenna Placement
Thank you very much guys. I have ordered the Zetagi antenna splitter (and a car radio to antenna adaptor I think I'll need), and I'll let you know how I get on!

2004 Jimny Mode: General Grabber AT3s (215/75/R15); Trailmaster 2" Lift; Jimnybits Snorkel; Jimnybits Front and Rear Recovery Points; Suntop Roof Rack; AVM Manual Hubs; Albrecht CB; Stainless Steel Exhaust System.

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06 Mar 2020 11:59 #219477 by TillymintDLG
Replied by TillymintDLG on topic CB Antenna Placement
I don't think I've listened to the radio for 20+ yrs now!
Just my own CD mixes (apart from Muse-The 2nd Law)....

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25 Mar 2020 19:14 - 25 Mar 2020 19:22 #220264 by furo
Replied by furo on topic CB Antenna Placement
Thank you for your help everyone. I have installed the CB with the Zetagi splitter and wired it all in. The only outstanding issue is the antenna, and I have a question about that: the current aerial is at an angle (as in the picture below), but all CB antennas I've seen are vertical. If I installed an antenna at an angle would that cause major problems? I'm not too bothered if my range is a little reduced.

If it is important for the antenna to be vertical, are there any easy solutions for this? The aerial base has an M6 bolt connection and I have seen some Scania antennas can be attached directly to this. Is it possible to bend an antenna so that it is vertical, or would that cause damage?


2004 Jimny Mode: General Grabber AT3s (215/75/R15); Trailmaster 2" Lift; Jimnybits Snorkel; Jimnybits Front and Rear Recovery Points; Suntop Roof Rack; AVM Manual Hubs; Albrecht CB; Stainless Steel Exhaust System.
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Last edit: 25 Mar 2020 19:22 by furo.

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28 Mar 2020 06:52 #220347 by kirkynut
Replied by kirkynut on topic CB Antenna Placement
Are you talking about the CB aerial that is now the only working aerial being at an angle?

If so I can't see why it will be an issue as long as it is not so low to whip anything or anyone.

Kirkynut

The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.

My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0

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