Create a Cheap Wi-Fi Antenna at Home: DIY Guide

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Make your own DIY Wi-Fi antenna from mesh items in your home
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Sometimes, your Wi-Fi signal just doesn't reach where you want it to reach. You've seen wireless adapters at the store, but they can cost a lot more than you want to spend. We'll show you a way to build a directional Wi-Fi antenna using off-the-shelf parts, no new software, and without opening your computer case. Get a significant signal boost for about $30 USD.

Things You Should Know

  • You'll need a USB Wi-Fi LAN dongle for your computer, even if you have onboard Wi-Fi.
  • You'll also need a USB passive extension cable, which you can find cheap at many retailers.
  • Attach the dongle and extension cable to a mesh sieve or other dish-shaped mesh metal item, then connect the extension cable to your computer.

Steps

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  1. This small device, about the size of your thumb, provides Wi-Fi capability to your computer. You will need this even if your computer has built-in wireless.
    • For best compatibility, get one that includes the 802.11b and 802.11g standards.
    • The shape of the dongle is important. For cost-effectiveness, look for a small thumb-shaped device. Larger "squashed mouse" models (~$50 – 60 USD) are generally more sensitive and powerful. Although they may be harder to mount, they perform better in more demanding setups.
  2. You want a Type A (male) to Type A (female) cable. You can find these at the dollar store or your local electronics store. This will connect the USB Wi-Fi adapter to your computer's USB port.
    • The antenna is directional, so you'll need to position it so it has a direct line of sight view of the wireless access point. Make sure your cable is long enough to position it where you need it, up to a maximum of 15 feet (4.6 m) (5m).
    • You can link multiple extension cables together if you need.
    • Active USB extenders (~$10 USD) allow further cable runs, which may even allow elevated outdoor antenna placement.
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  3. The easiest to use is an Asian "scoop" cooking utensil (shaped like a wok, but mesh) used to fry things—it's the perfect shape and conveniently comes with a long wooden handle!
    • Other options include sieves, steamers, pot lids, and lamp shades—as long as they are dish-shaped and metal. Any parabolic piece of metal mesh will work—bigger means a better signal, but harder to carry around.
    • Larger options include discarded DirectTV dishes or mesh-covered umbrellas, and although these should give more signal boost, mounting difficulties, and wind resistance tend to make about 12 inch (30 cm) (300mm) diameter the most practical.
    • Flexible stalk desk lamps allow these to be neatly mounted & positioned.
  4. Attach the Wi-Fi dongle and USB extension cable to the dish with twist-ties, tape, or hot melt glue.
    • You want the dongle at the focal point "hot spot" apex of the dish—radio signals come in and bounce toward the center, a few fingers above the surface of the dish.
    • The best dongle location spot can be found by simple experiments. One aiming method involves covering the dish with aluminum foil and watching it reflect sunshine—the spot with the most light is the dish's hot spot.
    • You may need a short support stick to get the dongle off the surface of the dish into this position.
    • Alternative support methods use string tied across the face of the dish like a spider web, hollowed-out plastic garden hose fittings, or even chopsticks!
  5. Insert the male end of the USB extension cable into your computer, and set that as your Wi-Fi card using your network settings.
  6. Locate the remote Wi-Fi transmitter that you want to access.
    • Your Wi-Fi antenna is very directional, so getting the aim right is important. Pointing the dish toward the remote antenna is the best place to start, although stray reflections from buildings etc may sometimes give good signals from unexpected directions.
    • You can use an inexpensive hand-held laser pointer to verify that you are aimed right at the wireless transmitter. It's great fun with your cat when you're done surfing the web!
  7. Once you are connected, tune your dish by adjusting the position of the dongle while watching the signal meter on your computer.
    • A program like NetStumbler for Windows or KisMAC for Mac can greatly help by giving you graphical readouts of signal strengths.
    • Compared with inbuilt Wi-Fi adapters, which are usually down at desk level and can easily be screened by metal walls, partitions, vegetation, or your body, even a simple elevated "woki" setup like this can boost signals and extend ranges enormously!
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Community Q&A

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  • Question
    Can I use a satellite dish?
    Community Answer
    Yes, you can.
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  • Question
    Will it require a password?
    Community Answer
    The antenna merely amplifies the WiFi signal, it will still require an existing wireless Internet access point.
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  • Question
    Can I send a WiFi signal directly to my TV with this antenna?
    Community Answer
    Yes, I believe it will work if your TV has a USB port and you know how to connect your TV to different WiFi signals.
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      Tips

      • This approach is suitable for other microwave radio technologies with a dongle adapter—Bluetooth & ZigBee especially—but won't work for infrared or memory sticks.
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      • To strengthen your connection, put a wall of tinfoil behind your router.
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      • There are many popular ways to enhance Wi-Fi reception. Most methods involve collecting the microwave radio frequency (RF) signal and getting that into the computer WLAN card. Since RF is very weak, this may be fraught with complications involving tiny wires and accurate measurements plus costly, lossy, coax cable and connectors. The USB-based approach puts the powered RF receiver (the dongle) smack into the dish's "sweet spot" and avoids that whole costly mess!
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      Things You'll Need

      • USB Wi-Fi adapter
      • USB extension cable (A to A, Male to Female).
      • Dish-shaped metal cookware—experiment!
      • Twist-ties, tape, or hot melted glue, etc.
      • A short stick support or plastic garden hose fitting.
      • Optional: Signal auditing program on your computer

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      About This Article

      Article Summary X

      To build a low-cost WiFi antenna, you'll need a USB WiFi adapter, a USB extension cable, and a dish-shaped piece of metal cookware. First, connect the USB WiFi adapter and USB extension cable. Then, attach them to the inside of the metal cookware using twist-ties, tape, or hot glue. Next, plug the antenna into your computer using the extension cable. Finally, aim the antenna at a remote WiFi transmitter. For tips on how to fine tune the antenna once you're connected, scroll down!

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