Positioning of CB Antennas

Smithy155 said:

Hi,

I'm soon to be getting a CB radio and i'd like to have 2 antennas, one of them just being for show. I was thinking of positioning them each end of the roof light bar that i have on order but i'd just like to know if thats a good place? I have seen picture after picture of the antennas fitted to either of the rear corners of the roof on defenders and would like to know if there is any reason for that?

Click to expand...

What you need is a co-phasing harness and then you can utilise both antennas with added performance benefits.

If you select antennas that have swr adjustment then you can make sure you get a nice swr reading.

Couple of chrome mini springers would probably look quite cool...and wont snap on the first low branch

If yu need a co-phasing harness to pick up CB signals at a distance of less than a mile, something is really wrong.

The Mad Hat Man said:

If yu need a co-phasing harness to pick up CB signals at a distance of less than a mile, something is really wrong.

Click to expand...

He wants to fit two antennas, dont remember suggesting he needs a co-phasing harness for distances of less than a mile, but he wants to fit two antennas on the vehicle so it makes sense to utilise them both.

If its less than a mile bugger cb, I'd seek out a 4watt pmr import such as a Weierwei V1000 or a decent glass mount cb antenna.

Or just open the window and shout.

magixorguk said:

Geek question sorry!
If you set the swr as low as possible on each antenna, then connect together as one as a t-junction in the coax, in theory you should be ok to use both at the same time as one antenna, if you had two pure 1/4 it would be like a 1/2 wave on your defender, question is how directional would it be? Side to side or front to rear, remember your grounding would be in the opposite direction to the antennas.

Any one who understands my rambling, be interested in your thoughts

/geek

Click to expand...

I understand your rambling, using two antennae you do get very directional reception/transmission with the added advantage of distance.

Popular for trucks in USA due to very long straight roads and side mounted antennae recieving/transmitting around a large trailer.

Almost no reason (apart from aesthetics, or you have a fibre glass bodied vehicle) to have that kind of set up over here and in theory could even be a disadvantage due to the lack of lateral (assuming side mounted)reception/transmission.

But as has been said before for communication of less than a mile it really doesn't matter what set up you have.
If it does then there is something very wrong with your setup

Bromsgrove Defender said:

I understand your rambling, using two antennae you do get very directional reception/transmission with the added advantage of distance.

Popular for trucks in USA due to very long straight roads and side mounted antennae recieving/transmitting around a large trailer.

Almost no reason (apart from aesthetics, or you have a fibre glass bodied vehicle) to have that kind of set up over here and in theory could even be a disadvantage due to the lack of lateral (assuming side mounted)reception/transmission.

But as has been said before for communication of less than a mile it really doesn't matter what set up you have.
If it does then there is something very wrong with your setup

Click to expand...

You wouldnt get any directional effect with the way he is talking about using them.

ForestofDoom said:

You wouldnt get any directional effect with the way he is talking about using them.

Click to expand...

Very true.