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Discussion Starter #1
I am planning on installing a CB in my Jeep. I am going to buy 2 Bulldog anntennas. Can someone tell me how far apart they have to be so they dont cancel eachother? I was also wondering how much the heigth of the anntennas effect the range that the anntennas can get a signal? Replies would be appreciated.
 

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If you are running two radios, then keeping them on other sides of the vehicle would probably be a good idea, but I'm not familiar with that.

If you're planning to "co-phase" them, and drive both with the same radio, save yourself the money. To do it right, they need to be 9' apart (1/4 wave).

I was looking into this for my ram, and had a nice long chat with an co-worker that does magnetic field work and used to be a big CB'r. So unless you've got a big-rig, you really won't gain anything.

Any when running co-phased, you are trading broadcast ability on the sides for broadcast ability front-rear. So while you can double the range to the front/rear, you lose it ALL on the sides... Fine for truckers in Kansas, but not so good for trail-use. So that's another thing to keep in mind.
 

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Thats really not true... I have dual K-40 whips (5') on my '79. I have them on either side of my truck bed towards the cab. And have no interference, however with them both hooked up the range and clarity was increased dramatically. I'd say that they are probably 4-4 1/2 feet part.

Just make sure that you tune them using a SWR meter. Tune them individualy (plug one into the CB, tune it, then do the same with the other one. The goal of tuning with the SWR meter is to get the meter to read as close to 1 as possible. Above or below 1 is acceptable, but 1 is the best. Once you tune them seperately hook them up using a T connector and hook the SWR meter up between the T and the CB to check the reading. It should be close to 1 but there's really nothing you can do besides tune each antena seperately.

Hope this helps, if not email me and I'll try and work you thru it.

-Chris
 

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Discussion Starter #4
Hey thanx for the information!!!
 
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