best antenna

[matysldn]

matysldn

Nice built.

Experimenting with different types of DIY antennas is fun.

I also live in a high rise building, surrounded by other high rise buildings, and I am not allowed to install anything on roof or projecting outside the window, but that did not stop me from experimenting with DIY antennas.

Have fun.

Thanks. You sound like you are living in the same building as me
I've got 8m to the roof and there will be a great location, but no way I will get access to it and instal an antenna.
I'm trying to launch the second location. On the roof at my workplace but at the moment I'm facing two challenges: lack of stable internet connection (weak WiFi signal on the roof) and my boss(not a big problem )

[AlejandroM]

well, i just find my best antenna is cantenna! and the blue stick.

it seems IT movie has came to my map.

globoss.png

do you want a ballon?...

[brunobl]

I've got 8m to the roof and there will be a great location, but no way I will get access to it and instal an antenna.

I envy you guys. I live in a valley, I'm surrounded by hills. My horizon-limited theoretical max range is some 80-90 NM in a few selected directions, but mostly a lot less than that. So I'm thrilled every time I get a 90NM hit, knowing that my "cantenna" is maxing out its theoretical limit.

[AlejandroM]

I envy you guys. I live in a valley, I'm surrounded by hills. My horizon-limited theoretical max range is some 80-90 NM in a few selected directions, but mostly a lot less than that. So I'm thrilled every time I get a 90NM hit, knowing that my "cantenna" is maxing out its theoretical limit.

cantenna works great, but you should try any other antenna fixed to 1090Mhz just to test.

[IZ8292SWL]

Hi guys!
Today i built the Spider Antenna without soldering!
I tried the collinear one with no success...
Result where really poor, maybe because i only used 6 pieces... who knows.
Anyway the spider seems pretty consistent and easy to build!
Results are a bit better that the modded whip (the one that you have to cut...)
ADSB.jpg

Anything to improve its weather resistance?
I have to find a nice place on the roof to use it beacause the quick test on the balcony shows a nice range all over the directions but not that far.
Immagine JPEG.jpg

Cheers and thanks for all the projects available

And thanks to @abcd567, always available to comment and help.

[abcd567]

Anything to improve its weather resistance?
I have to find a nice place on the roof to use it beacause the quick test on the balcony shows a nice range all over the directions but not that far.

Quick Spider - ENHANCEMENT FOR OUTDOOR USE

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[abcd567]

Today i built the Spider Antenna without soldering!

[ATTACH=CONFIG]11141[/ATTACH]

You are missing two cable ties on outer jacket to hold the radials in position. Without something to grip radials in position, wind will change their orientation, and these wont be equally distributed over 360 degrees.

Please see two cable ties (black) in the photo below. These ties are provided specifically to grip the radials so that these dont get dis-oriented by motion or wind.
Quick Spider.jpg

[AlejandroM]

how can i build a directional antenna? i want one to just get data from one side.

funny thing isnt?

or i just incline the antenna to that side? like: _/_

[wiedehopf]

Easiest way is to block signals from one direction with a metal plate.

Even directional antennas have large sidelobes in reception.
Overall it gets really complicated.

[AlejandroM]

thank you for your answer. i will check.

[abcd567]

SOURCE:
https://www.rtl-sdr.com/tag/corner-reflector/


Directional Antenna with corner reflector.

Corner Reflector Antenna for 1090-Mhz.jpg

[abcd567]

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Directional antenna for ADS-B?

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[matysldn]

You may find this helpful with building any type of antenna.
There is a lot theory about VHF/UHF antennas:

http://www.tigereye.net.au/vk4ion/do...F_antennas.pdf

Edit:
And there also:
https://www.qrz.ru/schemes/contribute/arrl/chap18.pdf

[IZ8292SWL]

You are missing two cable ties on outer jacket to hold the radials in position. Without something to grip radials in position, wind will change their orientation, and these wont be equally distributed over 360 degrees.

Please see two cable ties (black) in the photo below. These ties are provided specifically to grip the radials so that these dont get dis-oriented by motion or wind.
[ATTACH=CONFIG]11144[/ATTACH]

Hi!
There are two transparent cable ties in that picture but are not visible!
Also i used some silicone as suggested to cover the radials insertion.
But i'm a bit worried about that copper radials... will they corrode over time and affect reception?
Do i have to put something on them?
Cheers!

[abcd567]

But i'm a bit worried about that copper radials... will they corrode over time and affect reception?
Do i have to put something on them?

Apply spray paint or some sealant over exposed whip & radials to prevent corrossion.