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Old 02-23-2016, 04:44 PM
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Antenna spacing ?

I'm looking for info on antenna spacing for 2-meter and CB antennas.
I've tried google and most spacing info isn't about on the back of a jeep but rather large trucks or home/base stations. Everything I'm finding is saying 9" to +36".....

My CB antenna is installed on tire carrier almost centered on the jeep.

I could easily keep the CB antenna where it is and mount the 2m ~12" away on the tire carrier also. Not sure if this would be acceptable or not....
If I'd be better off moving both antennas to Terraflex taillight mounting locations.

I'd like to mount the 2m antenna once and be done.
Any suggestions and/or thoughts on spacing between the two antennas ?

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Old 02-23-2016, 04:50 PM   #2
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I'd suggest staying off the back all together. All though maybe convenient and maybe looks ok, electrically it is probably the worst place you could mount them. I just put the mounts on for my two (2m/440cm and CB) and am doing them on light mounts on the front a pillars. Much more ground plane available to them if you mount them up front.

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Old 02-23-2016, 05:01 PM   #3
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Cool

adamsesq:

Please post pictures when done.

Thanks
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Old 02-23-2016, 08:57 PM
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Thank you for the suggestion. I'll see what I can come up with.
I already have a led light bar so would just need to add a tab to it's bracket.

Any worries about and antenna being near the radio antenna.
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Old 02-23-2016, 10:33 PM   #5
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Quote:
Originally Posted by my996duc1 View Post
Thank you for the suggestion. I'll see what I can come up with.
I already have a led light bar so would just need to add a tab to it's bracket.
These are what I used for brackets:
http://www.amazon.com/gp/product/B00...ilpage_o08_s00

I've got lights on the bottom and will put antennas on the top. The jeep is at the dealership right now so I can't get pictures but will.

Quote:
Originally Posted by my996duc1 View Post
Any worries about and antenna being near the radio antenna.
At VHF/UHF frequencies and power limits, none at all.
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Old 02-23-2016, 11:10 PM   #6
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As Adam stated, unfortunately that is the worst pace to mount it. I just mounted my ham antenna on the fender

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I thought about using one of the hood stop holes, but didn't want to have it to much in my line of sight (even though it would have given it a better ground plane. )

here is a good write up on where to put your antennas
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Old 02-23-2016, 11:23 PM
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Thank you for all the great info !!
I'm thinking a cowl mount or light bracket mount will work out well.

Here is a picture showing my CB antenna and where I was thinking of mounting the VHF antenna. It sits high above the vehicle but not much metal below/around the bottom of it.
Glad I asked before mounting the new antenna. Thanks again !!
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Old 02-24-2016, 10:01 PM   #8
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I have a CB antenna and HAM Antenna on Teraflex mounts. I have no issues.
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Old 02-24-2016, 11:11 PM   #9
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Some get a little too worried about theoretical problems. In reality, most Jeepers mount their CB and ham antennas at the rear of their Jeeps where they work absolutely fine for our needs. I built my first 15m ham antenna and ham/CB gear in the early sixties and have been involved in CB, ham, military, and commercial 2-way radios ever since. My 2m antenna is mounted near the passenger taillight and the CB antenna is located next to the driver's side taillight. Both work superbly in those locations.
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Old 02-25-2016, 10:31 AM   #10
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Quote:
Originally Posted by Jerry Bransford View Post
Some get a little too worried about theoretical problems. In reality, most Jeepers mount their CB and ham antennas at the rear of their Jeeps where they work absolutely fine for our needs. I built my first 15m ham antenna and ham/CB gear in the early sixties and have been involved in CB, ham, military, and commercial 2-way radios ever since. My 2m antenna is mounted near the passenger taillight and the CB antenna is located next to the driver's side taillight. Both work superbly in those locations.
Just because it works, it does not mean it works as well as it could. Unless you have somehow figured out a way around physics or electrical theory, you are not getting the optimum performance that you could by better antenna placement. When I need to rely on my radios I want the best chance that I am going to get the best signal so I am going to put my antennas in the best place I can. But everything is a trade off and, as you say, the rear does work for some, it's easy and it's out of the way.
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Old 02-25-2016, 10:49 AM   #11
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This is where I am mounting mine...



Pretty typical, but have enough distance over the top that I believe that I will be ok.
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Old 02-25-2016, 11:13 AM   #12
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Adam, if you wanted optimal performance you would roof mount them with radials/ground plane attached to the underside.

Hood mounts are not ideal either. You still have coupling to the A pillar, while they are skinny, they are still in your visual field. If that works for you and you like the performance, fine. Others have different needs.

Vehicle radio systems are always a compromise. For the most part the radios are being used for trail / group communications and the rear mounting works just fine. Is it the absolute best – no, does it work – yes.
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Old 02-25-2016, 03:18 PM   #13
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Adam, if you wanted optimal performance you would roof mount them with radials/ground plane attached to the underside.

Hood mounts are not ideal either. You still have coupling to the A pillar, while they are skinny, they are still in your visual field. If that works for you and you like the performance, fine. Others have different needs.

Vehicle radio systems are always a compromise. For the most part the radios are being used for trail / group communications and the rear mounting works just fine. Is it the absolute best no, does it work yes.
Agree 100%. It's all about compromising to find what works best for you. The OP asked for opinions or suggestions and I'm pretty sure he has a few now along with some info as to why/why not to chose any particular spot.

If I had my druthers it would be further out in the hood and not on the a pillar but my wife won't handle the antenna in her view out there so it will be up close where it is basically hidden by the a pillar. My antennas are also not going to be as well protected from brush/branches by the jeep as they might be in the back. All compromises.
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Old 03-10-2016, 09:46 PM   #14
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Some things I have done for antennas.
First, CB and HF Ham antennas will need a good ground to work properly. Also on a vehicle the size of a Jeep, there are going to be compromises regardless of what you do. I have seriously considered the traditional ball mount on the passenger side of the near the rear. It provides a solid ground without going through any hinges and is out of the way of tops, doors, etc. It requires drilling a hole in the side of the vehicle though.

For VHF and UHF Ham antennas there are several options. Diamond makes an adhesive mount that works quite well on glass, the HRKS with a NR770HB 1/2 wave antenna. The coax is small enough to fit through the rubber seals for the rear window / tailgate. The antenna works very well when mounted on the rear side glass of the Freedom Top. I have used this antenna for over 8 years on my pickup and never had any problems with it adhering to the glass. Diamond sells a replacement adhesive pad if the antenna has to be removed and reinstalled.

I am currently experimenting with a Diamond K400C and an NR7900 mounted on the tailgate just below the top hinge. It seems to work fairly well and also doesn't need a serious ground. The NR7900 covers the entire 144MHz band with a fairly low VSWR so I can use it for FM and SSB portions of the band. It seems acceptable on 440MHz but not fantastic.

I tried the Hustler CG-144 on the K400C mount and it wasn't happy, it needs a ground.

I have also used 5/8 wave antennas mounted on the side of the hood. These have also worked well but not necessarily any better than the glass mounted ones I mentioned above.

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