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Thread: Mobile antenna for a base station antenna.

  1. #1

    Default Mobile antenna for a base station antenna.

    I know it would not be the best but Iím limited on what I can do . I canít put anything to permanent. I donít own the property. Then I can only go so high because of power lines . The base antenna that I want is a Tram1486 . Itís 5ft.3in long itís self but with the pole I have it would put closer to the power line then I would like.
    So I thought of just buying a Midland MXTA11 mobile antenna and the brackets I need to mount it to the pole. I may have forgot to mention it is a GMRS set up.
    Or I could cut the pole so that the Tram 1486 would only set about 5ft over the trailer roof. Let me know what you guys think.
    I have almost got this backup communication set up. Also a few of use in the group all get our GMRS license and we get our set up complete . We will also have a few of the Ham type radios so we can communicate with emergency services and monitor them . As in communication with authorities and other emergency services is only in a emergency and we have no other way to communicate with them in a emergency. Once things get real bad we go back to GMRS.and the other stuff will just be used for monitoring outsiders .


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  2. #2

    Default

    I may have also have got to mention is that I need the base station antenna system to be as easy as possible to move and reset up . As said I donít own the land so I may at some point have to move the set up somewhere else


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  3. #3
    Join Date
    Mar 2007
    Posts
    4,347

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    Something to keep in mind with vehicle antennas.

    They are designed to be mounted on a vehicle (no duh) but the average person doesn't recognize this is integral to the design beyond convenience of mounting.

    You don't want to just set one of them up on a rock, a wooden rooftop, or a fiberglass pole.

    They are designed to use the metal in the vehicle on which they are mounted to "push off" and will perform weaker than spec if they don't have that.

    If you're going to use a vehicle antenna in a stationary application, it would help to put it on a car-sized piece of sheet metal if possible. Or other large metal object.

    Someone correct me if this is wrong or outdated info - but that's my recollection from when I was studying for my HAM license.
    "The thing about smart people is they seem like crazy people to dumb people" - Stephen Hawking

  4. #4
    Join Date
    Sep 2007
    Location
    Central Texas
    Posts
    767

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    Use the Tram, cut the pole.
    Yea, though I walk through the valley of the shadow of death, I will fear no evil:

  5. #5
    Join Date
    Apr 2016
    Posts
    5,600

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    Look ...46 Camper.....it is your call..but you do not actually need a pole to mount an antenna for a base station...if you know how.

    I have a home made J pole antenna up some 60 feet into the air in a tree and I put it up there by using a fishing pole to throw a line over tree limbs and then hoist back some 1/8 diameter line or even paracord.....and then when I've pulled it back sufficient I tie off the antenna with the coaxial cable hooked up to it....and then use the 1/8th line to pull the antenna and cable up into the tree.

    It is also very easy to take this antenna down and transport it to where ever I need and then repeat the process to put it back up in a tree.

    Now mind you I am using a boat fishing pole with 25 pound test salt water line on it..not a light freshwater pole and line...but 25 pound test.

    No matter what you do you want to keep away from power lines...period...no ifs ands or butts. You don't usually get a second chance if you mess with power lines...

    Nonetheless...that is how I put many of my antennas up in the air without a mast or pole and have been doing this for years now.


    Also Bruss 01 is correct about mobile antennas often designed to use the metal body of a car as a counterpoise...a reflector.

    There are mobile antennas designed to not need a metal car body as a counter poise..and these are often referred to as co linear antennas....


    Nonetheless...that is how I put an antenna up into trees without a mast or pole. I've not used poles or masts in years and years now.

    Hope this helps.

    Orangetom
    Not an Ishmaelite.
    Last edited by orangetom1999; 04-28-2021 at 07:12 AM.

  6. #6

    Default

    Yes it has helped thatís how we plan to set up the antennaís for the couple of simplex repeaterís that we plant to put out . We have a couple of spots on our property that are kinda dead spots . Or thatís what we call them . Plus we want one for reaching on into the close town. That way we can to family members coming to us and guide them in safely during SHTF .
    I have it figured out how to do the antenna now. I have permission to put my poll where I need to. Also there is what the call a ground plane kit . Itís supposed to give the proper ground plane so you can use a mobile antenna as a field antenna or base antenna. So Iím going to give it a try.


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  7. #7
    Join Date
    Apr 2013
    Posts
    665

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    Your other option is making a square loop antenna. They have good gain and directional. Since you are probably bouncing off of a couple repeaters around you, it is easy to aim the antenna. The parts will probably set you back twenty or thirty dollars.
    July 4, 1776 - November 4, 2020
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  8. #8
    Join Date
    Apr 2016
    Posts
    5,600

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    Quote Originally Posted by Crazy Uncle View Post
    Your other option is making a square loop antenna. They have good gain and directional. Since you are probably bouncing off of a couple repeaters around you, it is easy to aim the antenna. The parts will probably set you back twenty or thirty dollars.

    That is precisely what I am running for my long range HF antenna....a loop consisting of a roll of 500 feet of 12 gauge stranded wire from Lowes.


    Something else for you to know 46 Camper..

    If you are out in the country and have a building on your property with a tin roof...and can mount an antenna on said tin roof....A tin roof makes for one hell of a reflector....both to capture/receive and get signals to go out into the air.

    There was a local fellow here in this neighborhood years ago who put his ground plane antenna in the middle of his tin roof house and Wow could he get out and also hear distant stations because of the tin roof. We used to call him the Tin Roof Specialist..

    You can do similar by placing an antenna in the middle of a pond if possible. Water makes a good ground plane in getting a signal out and also receiving. I used to take my car down to the river and get close to the guard rail..or tap my metal bumper up to the guard rail and start talking..

    If I pulled back about a hundred yards my signal fell off to those at a distance.

    Just some things you learn by experimentation.

    Orangetom
    Not an Ishmaelite.

  9. #9

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    Those are some good ideas orangetom. I have some aluminum printing press plates there I forget what the dimensions are . One side is shinier then the other . Wonder if I glued them down on my roof if they would work as a decent ground plane? Even if i was not going to use them as a ground plane for my base station I could use the plates for a ground plane at a simplex repeater site.
    Thing is the plates are thin . I can use my pocket knife to cut them .


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  10. #10

    Default

    Iím also going to get a slime Jim antenna for when we are out of the range of the base station. Plus I think it would open up more range from handhelds in the field to base station. Like I said later on Iím going to try and do a couple simplex repeaters. I just want to see what I can do with hand held and a base station set up first. With handheld I get 2 miles around my house .
    On a cold clear day / no leaves on the trees itís even further.


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