Instructables

How To Get WIFI Signal From 1/4 Mile Away [or more] for less than $60

Picture of How To Get WIFI Signal From 1/4 Mile Away [or more] for less than $60
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Yea I know, you don't believe me. 1/4 mile? Shenanigans.

Still reading? Great.
The whole thing started when I dropped my friend off for Horse lessons and didn't want to drive all the way home only to drive back to pick her up in an hour and a half. So what did I do? Drove to the closest neighborhood and got on an open WIFI network.

[NOTE: Connecting to someone’s WIFI without their permission is illegal in some areas!!!]
The network I connected to was a local realtor’s OPEN HOUSE FREE PUBLIC WIFI network…so I didn’t break any laws.

The problem was, the signal was very weak and I had to hold the computer at odd angles just to do a simple google search.

THERE HAS TO BE ANOTHER WAY!
So after about twenty minutes of searching and finding things like “wokfi” and “parabolic asian cookware” I had the basic idea of what I needed to do; Concentrate the signal onto the antenna using a parabola. After a bit more searching I found out how to build a parabola out of a cd and a glass pot top, but I figured that it would be too weak for the distances that I am looking for [I would like to be able to connect right from the parking lot at the stables] Then there was the world record holder who had built a reflector out of a 10 foot diameter dish but that was WAY too big. So I compromised and picked up a rooftop satellite dish from a guy on Craigslist.org.

Long story short I built the thing and drove out to the stables, turned the rig on, started netstumbler, and started looking it took a little bit but I got the right angle to lock onto a signal and SHAZAM! I was connected!

So I knew that I had working signal, not just a fizzled connection from the router. The noise was at -100 and the signal was hovering around -75 or so. Not the fastest connection but based on the fact that I was ¼ of a mile away from the router I would say I was doing pretty darn good!

Ok enough with the stories, how do you build the darn thing!

You need:
A satellite dish [and the four screws holding it to the roof [YMMV]
A pair of scrap 2x4’s
A tin can [green bean sized]
A usb extention cord 
A usb wireless adapter [in this build I am using the cheapest adapter I could find [$30 at target]
Two wood screws long enough to screw your two 2x4’s together
Some hot glue
An unwanted cd [I picked up a free netzero disk at Wally’s]
A glass pot lid shaped like a parabola
Some spray paint to make it look pretty
And some carpet of you are going to be mounting it to the roof of your car so It won’t scratch it.

The total cost for the build was only the $30 for the usb adapter, I had everything else on hand.

If you bought everything new it would cost around $60 [Not counting the dish]
 
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gcevaer10 days ago

my sister is moving to the other side of the property. Is line of site going to be a problem??? It's less than a 1/4 mile. More like 100 yards...but a lot of trees? I think you have came up with a great project but not sure if it will work for us or not...

ga. savian4 months ago

The USB adapter are a 3g modem ? What you used ?

Pfarmkid1 year ago
Fleetwood Mac didn't like the oven to much. Put it in a cold oven then set to 300°F. Only was in there for 15 minutes before I checked it. Cool effect though. Reacted to the heat almost like lexan!
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betula1 year ago
Great project! Gonna build one this weekend. Do you know wether the distance of the "feedhorn" / CD reflector in relation to the main dish makes any difference? If the USB wifi adapter/CD is closer to the dish, would you get a better signal? I'm trying to build something like this to use on an island we own. Mainland is aprox 3/4 mile away. Wide open between island and wifi spot on land, just water... Thanks for your instructable!
shortw1 year ago
I like your CD parabolic and how you mounted it on the arm.
However, a satellite dish like this is a offset antenna. If the dish would be mounted at 90 degree (vertical) ....straight up and down, then it would receive a signal from about 26 degrees up the skies. To receive a signal from a horizontal source then the dish has to point about 26 degrees toward ground.
Project Upcycle (author)  shortw1 year ago
That is about how it worked :) the adjustment bolts were loose enough to move the dish around and find the sweet spot using a program called ssid to measure signal over noise.
One more question.
Did you ever try to use a cd reflector shaped like a cone ?
It may trap more signals inside the cone and unto the wifi.
Project Upcycle (author)  shortw1 year ago
You aren't trying to trap the signal, you are trying to concentrate them on the antennae of your card, hence the parabolic shape.
Thank you for your response.
Where did you find the program ssid and how much money was it.
In the near future I like to build something like you did.

Project Upcycle (author)  shortw1 year ago
Google, it was free.
Project Upcycle (author)  shortw1 year ago
That is about how it worked :) the adjustment bolts were loose enough to move the dish around and find the sweet spot using a program called ssid to measure signal over noise.
cdillard1 year ago
So in your experiment the router is sending the signal a 1/4 mile to you, but your laptop could not see it without the dish?
Project Upcycle (author)  cdillard1 year ago
It was more like 1/3 of a mile. But yes.
cdillard1 year ago
The wireless router is sending the signal a mile away?
Project Upcycle (author)  cdillard1 year ago
Probably more, its just waves
Project Upcycle (author) 1 year ago
you would be supprised how far that signal goes, i have picked up connection with a 9 foot dish over a mile away.
cdillard1 year ago
How does this work if the router is not able to send wireless signal that far back to you?
sfry22 years ago
I just followed your formula with a slight variation with OUTSTANDING results. I live in a house in the country and there was no internet. I followed your instructions for building the rig..EXCEPT I took my Verizon USB (760) WAN data card and substituted that for WiFI.

When I started I had ZERO bars.. nothing.. after I build this rig.. I got FOUR BARS.. plugged it into my Cradlepoint mobile broadband router and now I have internet in my whole house. Once I get a broadband connection I will use this as a backup but you guys are lifesavers.. brilliant use of physics to solve problems.

Project Upcycle (author)  sfry22 years ago
AWESOME! I'm glad I could help!
TNThieding3 years ago
I am very excited to try this when I get all the materials. This will be a godlike tool to wifi dead zones in my house. Can't wait to build.

Do you think you could connect the end of the antenna to a wireless bridge instead of a USB port? I think it would work, but I would like to know what you think.
Project Upcycle (author)  TNThieding2 years ago
Yes, I have also used it to concentrate tv and radio signals, if you were to polish the dish you can also use it to heat up cans of soup [physics is fun!]
NeuroPulse3 years ago
Greetings,

I am not clear about the angles of the CD. Where is the focal point of the CD supposed to be? On the USB stick or on the satellite dish?

Would this work without the CD? What is the reason for two dishes?

How do I know if a pot lid is a parabola?

Thanks
Project Upcycle (author)  NeuroPulse2 years ago
if its curved lid, its a parabola, 99% of lids are.

The focal point of the satellite dish is supposed to be on the CD, it will usually be several inches across. The focal point of the CD is where you want your antenna.

This way you get two passes to catch the packets. The second parabola concentrates the signal to the size of a dime as opposed to a CD sized signal pattern.

You can find the focal point of your cd by aiming it at the light and moving your hand away from it until the light is as small as it can get [every parabola will be different]