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sssooo

Ohio

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Posted: 01/08/22 06:17am Link  |  Quote  |  Print  |  Notify Moderator

Can you run a ground wire to the chase to make a regular antenna work?

* This post was edited 01/08/22 06:25am by sssooo *

agwill

enosburg falls, vt

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Posted: 01/08/22 07:00am Link  |  Quote  |  Print  |  Notify Moderator

I believe you meant the case of the radio. The coax is already running to the case. Most antennas work best with a ground plane which is usually the other half of a shortened antenna. Good question but try YouTube for suggestions on antennas.


al

KD4UPL

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Posted: 01/08/22 08:27am Link  |  Quote  |  Print  |  Notify Moderator

A "wire" like a #10 copper wire for instance, will not work very well to make a good RF ground plane. You would need to use something like a wide copper braid strap. Even then, the antenna really needs a ground plane directly under it to work very well. What RV are we talking about? If you have metal framing: metal studs, metal roof trusses, etc. then you may do okay. If you have a wood framed RV then it won't work well.
Years ago Radio Shack used to cell a CB antenna that was advertised for marine use and didn't need a ground plane. I don't remember the specifics of how it was constructed. That's what I would do, look for an antenna that doesn't require a ground plane.
Technically, your RV does have a ground plane in the frame, engine, and any other metal but it's generally too far removed from where an antenna would go.

MountainAir05

New Mexico

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Posted: 01/08/22 08:57am Link  |  Quote  |  Print  |  Notify Moderator

Just get a top loaded antenna and you do not have to worry about a separate ground. It gets its ground thru the coax. Make sure you tune it using a swr meter.

ArchHoagland

Clovis, CA, USA

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Posted: 01/08/22 09:19am Link  |  Quote  |  Print  |  Notify Moderator

MountainAir05 said: "Make sure you tune it using a swr meter."


That is an absolute must do!


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ScottG

Bothell Wa.

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Posted: 01/08/22 11:47am Link  |  Quote  |  Print  |  Notify Moderator

Don't know what you mean by "regular antenna" but if you're referring to an AM/FM antenna the answer is NO. It is not tuned correctly (can't be) and you will fry the finals in the CB that way.

CA Traveler

The Western States

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Posted: 01/08/22 12:19pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

Don't know what you mean by "regular antenna" but if you're referring to an AM/FM antenna the answer is NO. It is not tuned correctly (can't be) and you will fry the finals in the CB that way.
X2 There are CB antenna for grounded and not grounded (NGP) antennas depening upon vehicle construction.

CB usage seems reather limited these days.


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wa8yxm

Davison Michigan (East of Flint)

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Posted: 01/08/22 04:26pm Link  |  Quote  |  Print  |  Notify Moderator

No the radio is generally already "Grounded" BUT.. You can get "No ground plane" antennas.. I used one.

OH. on my motor home I mounted it on the "A" pillar.. I mounted with the tip about 1" higher than the highest other point on the Rig (Instant bridge stick) Worked well.

I used half a Mirror mount... (The L shaped part) the antenna mounted as normal. 4 lag bolts to the pillar (Sealed) and a hole behind the bracket (Also sealed) for the coax to exit. the one I had had a "V" shaped notch to engage the rod it was designed to clamp to.. that's how the coax exited. Worked great.

Firesticks... they make a NGP design I'm told (mine was a differenet company)

Today I don't do CB any more.


Home was where I park it. but alas the.
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after a semi "nicked" it. Still have the radios
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FlatBroke

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Posted: 01/09/22 08:08am Link  |  Quote  |  Print  |  Notify Moderator

We use to ATV and had CB’s with Fire Sticks. Not much ground plane there and they worked well over the years for communicating. Guess it all depends on your use.



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Gdetrailer

PA

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Posted: 01/09/22 04:21pm Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

No the radio is generally already "Grounded" BUT.. You can get "No ground plane" antennas.. I used one.

OH. on my motor home I mounted it on the "A" pillar.. I mounted with the tip about 1" higher than the highest other point on the Rig (Instant bridge stick) Worked well.

I used half a Mirror mount... (The L shaped part) the antenna mounted as normal. 4 lag bolts to the pillar (Sealed) and a hole behind the bracket (Also sealed) for the coax to exit. the one I had had a "V" shaped notch to engage the rod it was designed to clamp to.. that's how the coax exited. Worked great.

Firesticks... they make a NGP design I'm told (mine was a differenet company)

Today I don't do CB any more.


While no ground plane antennas for CB do exist, they tend to not work as well as an antenna with a decent size of ground plane. One of the worst examples of a no ground plane antenna is the through the glass antenna mounts.

Typically the body of the vehicle will act as a ground plane, if you have a all fiberglass body then you will have to depend on the steel frame of the vehicle.

In theory the OP could create a simulated ground plane on say the roof of their RV (assuming fiberglass or non metallic roof) by running some wire radially from the antenna base on the roof like spokes. Four wires at 1/4 wavelength might be enough to create a OK makeshift ground plane.

1/4 wavelength at CB frequencies will be around 103", typically radials should be a bit longer (12% if I remember correctly) so four wires at 116" length should get the OP into the ball park..

Alternately could run some wire from the base of the antenna to the frame of the vehicle and see how well it matches.

Most likely will see very little difference in distance with either radials on the roof or connected to the frame.. CB distance typically is going to be 50ft on bad days and on good days a couple of miles.

Yeah, I no longer do CB either.. Gave my last one away for $5 at a Hamfest this last fall.. No one really wants them but mine was spotless and the guy took pity on it and took it home with him.. Feels rather nice without one laying around dong nothing [emoticon]

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