On Mon, 1 Dec 2008 21:58:02 -0800, (Dave Platt)
wrote:

In article ,
Douglas W. \"Popeye\" Frederick wrote:

You still didn't give any useful information. No surpise since
you have none. For an average of the cb band running 1/4 wave
the antennas should be spaced 54 inches apart. Use a
commercially produced cophase harness if you can find it. Make
sure you match the SWR and you will out do any other mobile
off the front or rear.

Top

Thanks Top!

I think that Top's calculations (and recommendations) are a bit off?

CB has an 11-meter wavelength. There are just over 39 inches in a
meter. Hence, the wavelength is around 430 inches.

Almost got it right but a little off.


The higher the "meter" the frequency gets lower.
11 meters is roughly 27mhz.
10 meters is roughly 28mhz.
2 meters is 144 mhz.

A "wave" is based on the physical length between nodes of the
frequency.

In reality, one wavelength at 27mhz is about 36 feet long.
A standard 102inch whip is a 1/4 wave antenna.

Just for you mister know it all top,
you might want to gander at this site.

http://www.cosjwt.com/index.php?a=20

It blows your 54" theory right straight to hell and then some.

As you'll see by the charts, there is virtually no difference between
1 and 2 antennas mounted on a truck.