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  #1  
Old 02-03-2019, 02:27 PM
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Default Homemade base antenna?

Im looking for a cheap solution to get a handheld radio to have better reception inside a metal hangar. Any ideas of a low cost solution?

Thanks
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  #2  
Old 02-03-2019, 02:49 PM
rv7charlie rv7charlie is offline
 
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Kitplanes has had probably a dozen different base station antenna designs over the years. A stroll through their archives should give you plenty of ideas.
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  #3  
Old 02-03-2019, 02:50 PM
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Hard to beat a copper J pole if you have somewhere to mount it.
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Old 02-03-2019, 04:04 PM
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Simple. 1/2 wave antenna.
Get a piece of copper rod 3'-10 1/4" long.
Solder it to the center lead of coax. You can use a piecebof PVC to hold it or fabricate something fancier. Works great with #12 Romex too.
Make four equal length rods for a ground plane. Cinnect all four and solder those to the shield of the coax. Four sections of any metal will work. Copper pipe, rods, etc.
Should be resonant at 121.500 Mhz.
Leave it up to you to make the mount.
I've made antennas with aluminum arrow shafts too.
Makes a great lightning rod so don't have it connected during a storm!
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  #5  
Old 02-03-2019, 07:35 PM
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Here ya go. You can tune it to optimize for airband. Instructions are on the website.



https://vk2zoi.com/articles/half-wave-flower-pot/
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  #6  
Old 02-03-2019, 08:15 PM
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Here is a short video on making a 2meter antenna. Just cut the lengths to 127.5MHz and you are good to go for the Aviation band. I have built 10-15 of these over the years and if done correctly will have about a 1.2:1 VSWR across the entire band. It is a very easy project to complete.

Building a 2meter base antenna

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Last edited by GalinHdz : 02-04-2019 at 07:19 AM.
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  #7  
Old 02-03-2019, 08:30 PM
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Quote:
Originally Posted by GalinHdz View Post
Here is a short video on making a 2meter antenna.
This is a good design; I've built many of these, too, with good effect. I've soldered the ground plane radials (downward sloping wires) rather than using the screw method. It will save a few $0.01's

Be sure to mount it OUTSIDE the metal hangar; on a 3-4 ft+ pole above the roof would be about perfect.
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Last edited by wjb : 02-03-2019 at 08:55 PM.
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  #8  
Old 02-10-2019, 11:19 PM
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When mounting a 1/4 wave ground plane antenna on the roof of the hangar, do i need to worry about the metal mount/hangar grounding the antenna? Should I somehow try to isolate the antenna from the ground? Does this matter?

Thanks guys.
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  #9  
Old 02-11-2019, 05:59 AM
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Quote:
Originally Posted by Av8rRob View Post
When mounting a 1/4 wave ground plane antenna on the roof of the hangar, do i need to worry about the metal mount/hangar grounding the antenna? Should I somehow try to isolate the antenna from the ground? Does this matter?

Thanks guys.
Nope. Just make sure none of the radials or the active element touches the metal hangar and get the antenna as high as practical above the top of the hangar. FWIW I mounted mine using a 8' long pressure treated 2x4 piece of lumber and it works great.

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Last edited by GalinHdz : 02-11-2019 at 06:10 AM.
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  #10  
Old 02-11-2019, 06:21 AM
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I had a homemade airband antenna that worked well at KCCB when I had a hangar there.

I am now using one of these tuned to 122.975 and it works perfect for the same amount of money had I made my own. I have it mounted the way it says here with PVC pipe but have a hook in the ceiling of my hangar with it hanging inside.


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