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Will a 36” x 24” x 1/4” thick aluminum plate work ok for a ground plane for a 102” whip antenna?

merlin

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There is NOT enough metal in a car or pick up sized vehicle to act as a ground plane for an HF antenna.
There is certainly enough to act as a counterpoise, especially at the upper part of the HF band, That I have proven.
A semi is great for 40 meters. Proven that too.
 

slowmover

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Did you bother to read the material I quoted?
Don't forget the bonding straps between the tractor and the trailer.
Tractor & Trailer

Graphite 5th wheel grease (conductive) after scrape, and hot water, high-pressure wash. Trailer kingpin area, also.

RF Bond plate to mount. Mount to frame.

Haz Mat fuel tanker (study). Static wicks, etc.

IMG_4923.jpeg

.
 
Last edited:

63Sprint

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Did you bother to read the material I quoted?
Don't forget the bonding straps between the tractor and the trailer.
Yes I did read the information. Thanks.

I decided to purchase a Pro Comm, Proton, PT99 antenna. I’m working on the mount for the camper.

The 102” whip will be worked with after the base antenna mount is completed.
 

jhooten

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There is certainly enough to act as a counterpoise, especially at the upper part of the HF band, That I have proven.
A semi is great for 40 meters. Proven that too.


How did you determine the vehicle body alone was acting as the ground plane, eliminate the capacitive coupling to the earth?
 

merlin

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Did you bother to read the material I quoted?
Don't forget the bonding straps between the tractor and the trailer.
Yes, but you can't understand what I post, and yes, you got lots of lights on semi trailers that would not work without a good ground.
How did you determine the vehicle body alone was acting as the ground plane, eliminate the capacitive coupling to the earth?
Well, I am not going to write a book here and capacitive coupling to earth is so insignificant it doesn't enter the equasion.
Here is a deal I will make: break out your sliderule and a VNA. Read through chapter 16 of ARRL antenna book, study thouroughly.
If you find anything that disagrees with what I post, and show with VNA results, I will never say another word about mobile antennas.
Some other links to information that can help you:
 

merlin

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Here is a chalenge for anyone: Explain in detail why a motorcycle with minimal ground plane can propagate a signal matching that of a full size vehicle.
 

merlin

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How does the dual antennas work being so close together?
Sorry if I seem to be hijacking the thread. These antennas are on different bands and the separation there is very little interaction.
This setup looks to me like it would do very well.
 

merlin

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From Antenna Myths

"A vehicle is not a ground plane for an HF antenna. Rather, it acts like a capacitor between the antenna, and the surface under the vehicle in question. That surface, whatever it is, forms the actual ground plane, albeit rather lossy." Spend some time on Alan's site. There is enough content there to keep you reading for a long time.


It doesn't matter where you mount your hf/cb antenna on a vehicle. There is NOT enough metal in a car or pick up sized vehicle to act as a ground plane for an HF antenna.
That antenna myths site has some good fundamental information but I think the statement ' A vehicle is not a ground plane for an HF antenna. Rather, it acts like a capacitor' is misleading and no specifics about frequency. It may be true when talking 160 to 20 meters.
Australia outback, they use 2, 3, 4, 6 MHz in mobile, but now we are talking broad band end fed whips with tuners. Very effective.
 
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