Quadrifilar Helix Antenna 2 4GHz

Yeah Andrew your the best.

Hi andrew! your antena is so good. my wifi router is TP Link wr840hp 2.4ghz with 8dbi dual antena, it's not enough reng for me. I want more reng. how can I increase my reng and make strong signal? Please help me!

greetings from texas, can you use a clothes hanger for the elements ? I am making two for my 3dr solo. I want them to be rigid.

Andrew, what is better to use - 32mm or 42mm tube? Will it be bad if I change the 65mm lenght to smaller or bigger value, depending on the size of the tubing?
THX!

Why do I suddenly have a craving for whipped cream?
;-)

Hello, great video man!! I have a question though, so is it just acrylic paint that makes the antennae black in the end of the video? Does that make it stronger or is it just for looks?

What would happen if you where to make the quadrifilar helix antenna twice as tall? But keeping the spaces between wires the same. Would it give higher gain?

can give me size of any element bye respect to lambda

ok. so I made 5 of these, 4 with the same materials of which 3 got painted with plastidip. then I made a fifth one, with thinner wire, not painted. Tried them on my quad, since i had no equipment at that time to test them. i got a disappointing result compared to my stock antennas.
Yesterday I did receive a MiniVNA Tiny, a small network analyzer. Hooked up my antennas and was blown away of how bad they were. I verified my nva by testing a few other bought antennas, which perfectly matched the expected data.
Has anyone else done measurements on theirs?
I did try to make them as close to the one in this video as I could, but mine were total failures. It could be me, but i have noticed that if you Google "QHF Antenna" all of them have a totally different design than these.

i just made one of these and it works a treat... i use it on my controller for my quadcopter and i have easily gained 300m on my range :) guna try a parabolic blade antenna next :)

Hi AndrewI really like your construction and attention to detail but you really have to test the antenna with a VNA to confirm that it works as designed.

have diy for 5.8ghz?

please show us how to build 1.5 G QFH Antenna for GPS!

What's the Axial ratio like on these antenna?

What a great job, ANDREW !!, so thanks a lot.

Hi Andrew,
Great information.
I have a question.
I work in very, very remote outback Australia. At least 100 km from any mobile phone cell tower. So I use a Thuraya satphone. The problem with it is that when I am travelling in a vehicle the phone drops in and out constantly.
I would love to build myself a QFH antenna for it that can be mounted outside. Eg. on a roof bracket or on the bull bar.
Thuraya is 1600 Mhz (1.6 gig hz) LEFT HAND circular polarized.
I believe that most GPS and satellite weather transmissions etc are RIGHT HAND.
So my question is; which way do I twist the elements of the QFH to get LEFT HAND CIRCULAR ?

you made the leads out of full wavelength (125mm) can you make them half or quater wavelength to save of weight? and would you have to reduce the size of diameter of jig to wrap the leads around.or is the space of the half circle crusial to the strength of the 2.4? im sorry if my quationing is confusing.

hello andrew , i have a question,why did u bent only lambda/8 part of the the helix.

I built this, as described, using some recycled TV coax and common US copper mains wire. It works excellent on an old Linksys router setup as the transmit antenna. I'm running the router as a repeater and using DD-WRT firmware. The Tx is set to max power (251mW). With the factory antenna, I was getting intermittent connection 100ft away through 4 walls and around a water heater tank (same power settings). Now I get signal over a block away from home... and now have to turn the power down because I can't connect to the source router due to interference...

Didn't you once sold these on Ebay?

you could do a ranking of which best antenna

this has nothing in common with real quadrifilar helical antenna for 2.4 GHz! this is complete bullshit!

...and your balun is a JOKE! 😂LOL

how could you mount that antenna on a quad, hasnt it a significant directivity?

you would have no fade spots above....great for satellite work

This is your worst video

dB?

Audio MUCH MUCH better

Andrew, I can't access your shop. Can you give details please?

So the choke is only connected in one side ?

Sir: I know this is an old video, but do you happen to know the bandwidth of this antenna design? I am in need of a good CP omni directional antenna to use on 2200-2400 mhz for COFDM/mpeg 4/H.256 HD wireless camera transmission systems. We presently use 6dbi collinear antennas provided with our wireless systems. They perform very poorly. I believe this design being CP and better gain will help us very much. I’m assuming this design is not a very wide bandwidth design? I would like to tweak the dimensions for my center frequency of 2300 mhz and see if it will still perform well at the top and bottom of the frequency range of 2200-2400 mhz? I was wondering if you were ever able to sweep the antenna and see the useable bandwidth? If not, I will try to build one and test it on the network analyzer and see what the bandwidth is. I like the design. I have used several dual helix hemispherical antennas on receive, with good performance, this seems seems similar in design. The Hemi may have more gain on the zep since it is lower profile? Not sure? I would love to see the pattern of this design compared to a hemi design. I have found similar design antennas to these available, but at $800 usd each. I have seen them for as much as $1200 usd each. At that price I would like to build some. Thank you. Great videos. I love the channel.

how much are these on ebay ?

How does it compare to the omnidirectional biquad antenna you made??

Is possible to do this antenna for 433mhz, thanks

by high gain do we mean distance or data throughput ?

Can you make a guide for 5.8ghz quadrifilar

No access to your link?

I want one how much I'm in the uea

is this better than a double biquad antenna? what's the gain advantage?

Can I use this design as an external antenna for my home 4G LTE-A ROUTER AND CAN THIS BE UPSIZED

What kind of glue used in this video? Glue after soldering

Hi, i'm interested in building this for my fpv receiver, just wondering looking at the way this is built doesn't the active end short with the shield or ground? sorry if my question sounds silly, but i really have no idea how the quadrafilar antenna works at all.

So this is 2.4 gigahertz.
How can I calculate to make an antenna with different frequencies?
What is the formula?

Electrically, the copper wire will be much better (lower resistance) than the iron wire. The antenna will have a much better 'Q' with copper.

Did I miss something or did you forget to show how the coax connects and to which element? Also, did you just dip it in something or it's that heat shrink all over it?

Why would you make a QFA for 2.4 ghz? They make good omni antennas for sure, but I mainly see them for GPS and other satellite ground stations since they also radiate/receive upwards.

erm, you're making your QFH's very wrong ! The QFH has two long helix and two short helix, plus two of the elements (one long, one short) connect to the coax screen, the other two (long and short) connect to the coax center plus you have no balun or choke (a QFH is a balanced fed antenna) :( .. I can't comment on what the radiation pattern will be with what you've done, but it won't be what it should be - circular polarized (left or right) handed !