Instructables

WIFI Antenna Hack!

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Picture of WIFI Antenna Hack!
Turn your standard WIFI antenna into one just like the $30 range extender antennas for about 5 cents! Follow these easy steps, and then check out the video if you need extra clarification. Digg if you like my very first Instructable.


 
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Step 1: Remove the top of your stock WIFI antenna.

Picture of Remove the top of your stock WIFI antenna.
A small flat jeweler's screwdriver works great!

Step 3: Measure off 2 3/4" of your wire and make a small bend.

Picture of Measure off 2 3/4
Then, starting with the bend, use the grooves of the drywall screw as a template and make 7 COMPLETE loops, then bend the wire flush to the screw after the sevenh loop. just unscrew the drywall screw to remove it from the wire.

Step 4: Measure off 3/4" from the end of the coil and cut.

Picture of Measure off 3/4
Then strip off 1/8" of the insulation or sand off 1/8" of the coating on non-insulated wire (depending on what you're using).

Step 6: Solder the new antenna onto your cut down and stripped stock antenna.

Picture of Solder the new antenna onto your cut down and stripped stock antenna.
Overlap all the bare wire from the stock antenna base and the new antenna.

Step 7: Use a large diameter drinking straw and slide it over the new antenna.

McD's has them... they're slightly larger diameter than a regular drinking straw. I think they're for shakes, etc.

Step 8: The straw fits perfectly and snugly on stock WIFI antenna bases.

Picture of The straw fits perfectly and snugly on stock WIFI antenna bases.
Amazingly, you don't even have to glue them. It's a match made in heaven! Use a black permanent marker or paint for a pro look...

Step 9: All Done!

Picture of All Done!
Looks pretty good! You get a more omni-directional output (less fiddling with exact antenna placement) and approx. 5 dB gain. It works REALLY well on both your wireless cards and routers. See my video to see the results, and Digg this if you like my very first Instructable! 8D


milejoyesterday
Hi babblin I'm hacking my two netgear extender antenna. I'm reading your instruction but it 's not clear the total lenght of antenna? How many inch from the loops to the end?
milejoyesterday
Hi babblin I'm hacking my two netgear extender antenna. I'm reading your instruction but it 's not clear the total lenght of antenna? How many inch from the loops to the end?

db stands for decibel

so if you have a 10 db to start out with and add 5 db you end up with almost 1,000

.if you have a three db gain then it doubles what you start out with so 10 db+3 db gain=100 db add 3 more and you get 1,000 db with a 6 db gain so its a littol less than 1,000 b/c the gain is 5 db

hope that helps

KK4YTT

Eddie

tech10110 months ago
Beth posted a question about adding windings and using bare wire

Information: at this frequency subtle changes make big differences.
Also if using bare wire windings should not touch,the all windings make a coil and a coil is whats known as inductive. every winding alters frequency slightly. ( i use transformer wire which is coated with shellac or insulated wire) adding windings windings can be tricky without test equipment. As far as connection is concerned usually an cheap radioshack ohm meter will tell the story (should be zero ohms from connector to tip)
Suzi17s1 year ago
I am a kind of ignorant about this.
Can someone explain me what de 5 db gain means?
jenmar771 year ago
Wow, love the simplicity, great first :)
I did this hack, but it did not improve my signal at all. While I believe I applied each step correctly, I will detail the process below in case anyone can spot a problem. My only request is that you not post comments based on empty guesses when you haven't tried this hack yourself. EG "Are you certain you used the correct COLOR screw"? Thanks..

In the spirit of the hack, I used what was around my house. I had a roll of 20 gauge copper wire (bare), so that is what I used. After cutting the proper length, I used a 2 inch coarse thread drywall screw without any problem. I am crappy at soldering, so I used butt connectors designed for 18-22 gauge wire (red). I tested to be certain the antenna-to-wire connection was firm. Slipped on the straw cover and screwed antenna into router. Restarted router and refreshed wireless networks. Nothing, nada, zip. Still the same two bars I had before the hack. Because I had the same signal, I believe there is no break in the hack wiring or problem at the splice, or the signal should be worse.

Did I miss something? Anyone else had this problem and solved it? Has anyone tried adding the extra 14 loops, and did that work? Other helpful suggestions?

Beth
fyrion2 years ago
hi all before some time i took PCI WI Fi card with 2 antennas and the antennas are the same like on the video at the beginning so does this modified is going to improve the signal cause there is alot of Wi Fi signals but them are a with a little bit poor signal
Hi, i thank you for the replys for the 3 links much apreciated, but it is to tecnical for me on those sites, but it still does not give me a simple answer to increse more turns on the copper wire, kind regards Brian
brian-kn2 years ago
Hi, i am from the UK, it has been asked before but can you increase the gain of the aerial, from 7 turns around the wood screw, then a small space then 14 turns then 28, Kind regards, from the UK brian-kn
Thanks was looking for something so simple, but clear and effective as you have posted 100%full
ANDY!4 years ago
would soldering the antenna to a piece of aluminum (laptop case) work?
zack247 ANDY!4 years ago
theoretically, yes. but the laptop would have to be metal. i think if you put a wire in the top part of the laptop soldered to the metal shell of the lcd, you will most likely get the best results
Fuogger zack2474 years ago
Now this makes me want to take the standard antenna, strip it down, and solder it onto the side of the entire desktop computer case. Forget the wimpy laptop case, forget the ethernet cable, welcome to the age of the casetenna!
KC8RJS Fuogger3 years ago
You obviously cannot solder your wireless adapter to a metal case, there  is something we like to call resonant frequency and attaching something that will cause a mismatch load to the transmitter (1:1) will more than likely damage it over a short period of time. A quarter wave length dipole for 2.4Ghz is 1.23 inches and a full wave is nearly 4.92 inches.
i have an apple mac g4 case which i modded to become a pc case, can i use a wifi card cable to use the internal (apple case aerial) attached to that case?

if so that would put my server down to running on just 2-3 wires (trying to have the least ammount of cables so i can do a (set it & forget it) in my back room. :-p
I dont see why you can't your range will be less than optimal being inside the case, so you may want to use NetStumbler and check your readings after the install, at the very least you may need to move the case to get a descent signal to where you're operating.
cheers for the advice, but as my card has 3 aerials, i would only be using one socket and using the other aerials as normal.

when i get chance, ill try it :-)
I would also like to add that a pc case has the ability to be a case ground, which means if any short were to happen against the metal frame you have a circuit fryer
zack247 Fuogger4 years ago
but wouldnt you need a wireless card for that? but great idea. cases are made of steel, so its conductive, and soldering a wire to the case ould turnit into a giant antenna. i get it, and its ingenious!
ANDY! zack2474 years ago
 I have a wireless thing in the laptop soldered to the steel frame. Dell was smart.
zack247 ANDY!4 years ago
except when it came to batteries. any of the laptops made before 2004 had battery problems. the battery would short circuit or something and the laptop wouldn't turn on if the battery was attached. you had to keep them plugged in for them to work
ANDY! zack2474 years ago
 that has happened to me.
Fuogger ANDY!4 years ago
That's the issue I have now, battery lasts all of one minute if I'm lucky. Second time this has happened to me. Oh well.
zack247 Fuogger4 years ago
i wonder why dell didn't make very good batteries? my friend had a dell, and at a full charge, the latop literally doesnt make it past the loading screen. it lasts about 30 seconds. and im not exagerating. (i think thats how its spelled?)
exaggerating .
And i am actually fighting for my 9 cell to run for more then 5 hours ==
Hopefully HP will stop putting those lousy nvidia chips "heat stoves" into new generation laptops .
ANDY! ANDY!4 years ago
 i took the battery apart and the multimeter shows a strong current. the circuit board doesn't work
zack247 ANDY!4 years ago
ah, the battery overcharge protector board. possibly the most useful and annoying of the boards
craobhruadh2 years ago
Anarky to answer your question.....It works very well!. My little girls computers are sharing a wireless internet connection. And their placement is a little lacking IE behind a couch...ever try to argue fashion versus function with a woman?....yah..

.Their wireless card has a similar antenna to the one on my old D-link so dust off yee ole G router and steal it's antenna.

well I didn't have any copper cable around until I remembered I was sitting on tons of coax.

So I stripped it out (use a pair of wire strippers or you will chop it in half) followed his directions to a T, minus i went with a paper-mate pen casing in stead of a straw, it is stronger and similar to the real casing comes in a variety of colors and has a cool pointy tip :).

with the old antenna I was getting a .85 megabit pull on speed test. with two little girls playing online Pokeman games sharing the same wireless it was bad. But add the antenna hack and it went up to 2.87 Megabits. to confirm this I put the old one back on and retested right back down to .85- .89

took me 5 minutes to make this thing (butane soldering iron is the bomb)

I cant thank him enough a nickle worth of old sat cable saved me 30 bucks and the headache from my girls "daddy my internet sucks"

Havent heard from them in days.

Now I will see if this ups my wireless bridge as well!!!!!!!! Burhahahahah cough cough

can i use the 2.4GHz wifi antenna for my hspd dongle (for mobile frequency rang)
no, the HSPA (High Speed Packet Access) uses a different frequency to WiFi
wifi is 2.4-2.5Ghz, mobile network is 850, 900, 1800, 2100Mhz ~12.5CM is the band length of wifi, ~30cm is the wave length of 900Mhz band.. now for helix coil on that you need it to be a total of 1/4th the band with to do the right effect..

read both these if you want to melt your brain ;)

http://en.wikipedia.org/wiki/Helical_antenna

http://en.wikipedia.org/wiki/Dipole_antenna#Frequency_versus_length
ncham2 years ago
http://www.youtube.com/watch?v=SNQfBW3_ZMs
SIRJAMES092 years ago
I have a Q:

I have an old CB antennae that has been sitting around for like forever...would that work?? *evil grin*

I know that I would have to build a base for it & all that, but if it'll work to REALLY pull in the net or whatever, then it will have some purpose.....otherwise its trash
You would have to make sure the length of the antenna is correct for the resonant frequency (or part thereof). Most mobile type CB antennas range from 2-8.5 feet in length, which is the proper length for 1/4 to full wave resonance on the 11 meter 26.000 to 28.000 MHz CB band. As wifi broadcasts on 2.4 GHz the resonant length would be quite a bit shorter.
suayres2 years ago
I'm totally ignorant about wifi (my caveat/confession): is the length of the antenna why my wifi connection keeps dropping in and out? I get it thru my cable company and it drives me crazy, especially when it drops out right in the middle of an instructable! It comes in thru our own router, and ever since getting the our own router is when the dropouts started. If amplifying the antenna will do the job, I'm all over it! Thanks for your help.
probably not, it's likely your router. Even if you get your wifi router from your company you can still connect a second wifi router and use that. I would recommend a WRT45GL by linksys with the tomato firmware installed. I have one and it works perfectly.
i place all my time and faith in a belkin wireless router. it is very well worth it. you dont need the all new one because older ones work perfectly. and you also dont need any software to be put on it to make it faster. although you can if you want to.
You were right: I called the nice people at Belkin (manufacturers of my router) and they talked me thru a re-conformation/reworking of my router and now, it works great! I don't know if we set it up wrong or what, but it hasn't dropped out even once since doing it. To be perfectly honest, I have NO IDEA what I did, but whatever it was, it fit the bill!
Fixerdad2 years ago
What is the length of the antenna segment after the coil? Is the length critical? I'm guesstimating from the pix. Thanks!
I liked the Drywall Screw as a coil form! Nice trick.
I Think that you could use a length of Heat Shrink Tubing instead of a straw - or perhaps in conjunction with a straw - maybe put an eraser off a pencil into the open end of the straw first - then heat shrink. You can use several pieces of HS Tubing - one over the other - to make a pretty stiff antenna.
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