AB9IL.net

Linear Focus Parabolic Wifi Antenna

Disclosure: AB9IL.net is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program such that this site earns advertising fees by linking to Amazon.com. If you make a qualifying purchase after clicking a link on this website, the associate affiliated with this site may earn a comission at no cost to you.


#Advert: Content creator laptops from MSI - ready for your ideas.

New Features: Global Quick Tune Internet SDR List Improve Your Radio Knowledge at "YouTube SDR School"
Article Index --- click here to unfold ---
Newest Pages NEW: Trumpists Kicking the Hornets Nest
NEW: Introduction to Catbird Linux
NEW: Skywave Linux Updated to ver 4.1
NEW: i3wm: Using i3-ipc to Float Windows
How to Record from WebSDR and OpenWebRX Sites
Programmatic RTL-SDR Frequency Claibration
Public KiwiSDR Lists
Malaysia Airlines Flight MH17: Simply Mass Murder
The Anonymous Cathay Pacific Employee Letter to Hong Kong
For For Cathay Crews Crossing Borders With Electronics
Photo Gallery 9: The New Life Movement in China, 1944
E Pluribus Unum: From Many, One, Dammit
HFGCS Quick Tune SDR List
The Robert Mueller Iron Triangle Speech
A Rant About One Party Rule
Best OpenWebRX and WebSDR Servers
SDR School via YouTube
ADALM-PlutoSDR on Linux Systems
MOFO Linux: Defeating State Censorship and Surveillance
Linux: Distros, Code, and Nifty Software NEW: Introduction to Catbird Linux
NEW: Skywave Linux Updated to ver 4.1
NEW: i3wm: Using i3-ipc to Float Windows
Skywave Linux: HPSDR, WebSDR, and RTL-SDR ready to run.
Siduction Linux with the Cinnamon Desktop
Siduction Linux with the LXQT Desktop
Andy's Ham Radio Linux 15 and QtRadio
Booting Multiple Linux Disc Images with Grub2
Porteus Linux Hard Drive Installation
UPDATED: MOFO Linux - For Unrestricted Internet
Aptosid with LXDE
Asus EeePC 1215N with Linux
Autostart Tweaks for KDE3 and KDE4
Broadband Speed Tweaks For Linux
Fixing the Firefox 3 Rendering Bug
Linux on Solid State Drives
Linux Wireless Interface Driver Updates
Setting Polkit to Automount USB Devices
Sidux with LXDE
Fixing Skype Inverted Video
SLAX Remix - kernel upgrades
Flash Drive Linux - Introduction
Flash Drive Knoppix 5.3 - Part 1
Flash Drive Knoppix 5.3 - Part 2
Flash Drive Knoppix 6.0 - Part 1
Flash Drive Knoppix 6.0 - Part 2
Flash Drive SLAX - Part 1
Flash Drive SLAX - Part 2
Flash Drive Bluewhite64 - Part 1
Flash Drive Bluewhite64 - Part 2
Flash Drive Linux - Basic Customization
SLAX Customization - Part 1
SLAX Customization - Part 2
Bluewhite64 Customization - Part 1
Bluewhite64 Customization - Part 2
Long Range Wi-Fi Basics of Long Range Wireless Networking
Linear Focus Parabolic Wi Fi Antenna
High Gain Wi Fi Dish Antenna
High Gain Helical Wi Fi Antenna
High Gain Yagi Wi Fi Antenna
High Power Wireless Adapters
Wi Fi Extender Antenna for Routers
Belkin F5D7050 External Wi Fi Antenna
Linksys WUSB54GC External Antenna Mod
Compat Wireless Linux Drivers
Installing WPA_Supplicant for Wi-Fi Security
Linux Wireless Interface Driver Updates
Linux Wireless Interface Driver Support
NetworkManager and Consolekit
RT73 Wireless Drivers for Linux Kernel 2.6.27+
RT2860 Wireless Drivers for Linux Kernel 2.6.27+
Radio: Amateur Radio, Aero Radio, Shortwave, etc NEW: Programmatic RTL-SDR Frequency Claibration
NEW: Public KiwiSDR Lists
NEW: GHFS Quick Tune SDR List
UPDATED: Best OpenWebRX and WebSDR Servers
UPDATED: Skywave Linux: HPSDR, WebSDR, and RTL-SDR ready to run.
CubicSDR on Debian, Ubuntu, and Linux Mint
Dump1090 for Linux Mint 17.1 and Siduction 2014.1
Software Defined Radio - An Introduction
QS1R Direct Sampling SDR
Chaining SDR Audio Interfaces
FLEX-6000 Direct Sampling SDR
UPDATED: RTL2832 Software Defined Radio
WebSDR Digimode Reception
Enabling FLASH in Jack Audio
Realtime Software Audio Processing
Liberation Technology MOFO Linux - For Unrestricted Internet
Veracrypt Encryption for Linux
Veracrypt Encryption for Windows
Using Google Within China
Popcorn Time and Flixtor for Uncensored Streaming Media
DNS Encryption using DNSCrypt
Galaxy Nexus Privacy and Robustness Enhancements
Galaxy SIII Privacy and Robustness Enhancements
Flash Drive Encryption for Linux
Flash Drive Encryption for Windows
Multihop VPN Connections for Strong Internet Privacy
Open and Free DNS Server List
OpenVPN Cloaking against Deep Packet Inspection The Serval Mesh Phone Project
Skype's Robust Security
Man in the Middle Wireless Security Risks
Wireless Security and Surveillance
Digital Audio Adjusting Audio Dynamics in VLC
Backing Track Prep Guide
Ipod Music Processing Guide
How To Record Record Live Music Performances
Realtime Software Audio Processing
Chaining SDR Audio Interfaces
Aerospace Radio, Aviation, Pontification, and Opinion NEW: Trumpists Kicking the Hornets Nest
NEW: The Anonymous Cathay Pacific Employee Letter to Hong Kong
NEW: For For Cathay Crews Crossing Borders With Electronics
NEW: E Pluribus Unum: From Many, One, Dammit
NEW: HFGCS Quick Tune SDR List
NEW: The Robert Mueller Iron Triangle Speech
NEW: A Rant About One Party Rule
Captains Authority Versus Autocratic Airline Management
Malaysia Airlines Flight MH17: Simply Mass Murder
Malaysia Airlines Flight MH370 - A Media Circus
High Gain Air Band Antennas
Apollo Unified S Band Communications
Chinese Anti-Stealth VHF Radar
Oceanic Communications - Procedures, Equipment, Voice and HFDL
Boeing 737NG Radio Equipment
Boeing 767 Radio Equipment
NAOC-TACAMO Monitoring
My Flight on 9/11
Joshua Chamberlain's Leadership Tips
Special Operations Forces Truths
TWA 800: Just Give Me Some Truth
Photo Gallery Aviation Photo Gallery 1: Snapshots From My Journeys
Aviation Photo Gallery 2: On the Road With ATA Airlines
Aviation Photo Gallery 3: More ATA Airlines
Aviation Photo Gallery 4: Southwest Airlines is the Borg Empire
Aviation Photo Gallery 5: Starting Over, Moving On...
Aviation Photo Gallery 6: More Viva Macau
Aviation Photo Gallery 7: Mainland China Airline Flying
Aviation Photo Gallery 8: Chinese Smog and Fog
NEW: Photo Gallery 9: The New Life Movement in China, 1944
Broadcasting BBC Radio Blooper - Adolf Merckle
TV DXing the World Trade Center
New York TV after 9/11
Live Music Recording Adjusting Audio Dynamics in VLC
Backing Track Prep Guide
Ipod Music Processing Guide
How To Record Record Live Music Performances
Radio Poetry and Arts In Distress, by David Wagoner
Just A Radio Operator, by Robert A. Wallace
Radio Circuit Modifications ATS-909 Modifications
ATS-909 Manuals
ATS-909 Alignment Procedure
ATS-909 Alignment Spectrograms
Very Low Frequency (VLF) Radio Internet Based VLF Radio Listening
Windows Tips Windows Performance Enhancement Tips
A Faster Windows 7
Windows 7 SSD Setup

Parabolic wifi antennas are generally thought of as dish shaped objects, fed by a yagi, biquad or helical radiator at the focal point.These dishes are curved in three dimensions and involve considrable effort to construct from scratch.An alternative is the two dimensional "linear focus" reflector. It focuses energy along a "focal line" instead of one point, and works quite well with simple dipole antennas.Design is as simple as selecting a suitable parabolic curve, plotting it on a flat surface, and fitting a sheet of mesh or solid metal to the parabola.

Doing the design calculations by hand is quite time consuming; there is excellent software enabling one to create a template and in minutes. For doing the calculations, one good parabolic antenna calculator is HDL_ANT. Another very useful calculator, called Parabola, was designed originally for solar cooking, and can be used for making wifi network antennas. When using these, bear in mind that the f/D ratio (focal length /diameter) should be between 0.3 and 0.6 for optimal performance.

This linear focus parabolic wifi antenna consists of a sheet of metal shaped to precisely fit a two dimensional parabolic curve. Gain is about 15 dB over a dipole, and depends greatly on quality of construction.Of greatest importance is shaping the sheet metal to accurately follow the parabolic curve given in the template.Parts may be found at large hardware retailers such as "Home Depot" or local scrap metal dealers.Versions of this antenna have been made using automotive sheet metal; others use wire mesh.Whatever the material: follow the curve!

#Advert: Go parabolic with a fabulous Prostar laptop.

This antenna can be built in a couple of hours and involves a fair amount of measuring, cutting, bending, and bolting metal.Use caution around the sharp edges when finished, put it up and enjoy a very durable antenna that provides great signals.

Parts & Equipment Required:

  1. one 36" x 2" aluminum flat (to be referenced as flat "A")
  2. one 36" x 1" aluminum flat (to be referenced as flat "B")
  3. one 14" x 36" sheet of aluminum flashing
  4. metal cutting shears
  5. a yardstick or tape measure
  6. three 6-32 x 3/4 machine screws (the long screws)
  7. two 6-32 x 3/8 machine screws (the short screws)
  8. five 6-32 machine screw nuts
  9. one drill with a 1/8" bit
  10. one fine point felt tip marker
  11. two clamps
  12. a pair of pliers
  13. a hacksaw
  14. Parabolic Template, printed as a poster (3 x 3 = 9 sheets), carefully aligned and taped

Parabolic 802.11 antenna template

A parabolic wifi antenna template,
created by Michael Erskine.

Template for Long Distance 802.11 Antenna

Another parabolicwifi antenna
template, more suited to a
biquad feed.

Linear Focus Parabolic back

Rear view of the linear focus
parabolic wifi antenna.

This antenna can be constructed in a couple of hours and some measuring, cutting, bending, and bolting metal.Use caution around the sharp edges. When finished,put it up and enjoy a very durable wifi antenna that provides long range and high bandwidth connectivity.

Assembly Procedure:

  1. Mark all flats and flashing from edge to edge along their centerlines and across midpoints, both sides.
  2. Mark dots on flat "A" along its centerline, at the 1," 18," and 35" points. Carefully drill holes at these points.
  3. Abeam the hole at the middle of flat "A" drill holes on both sides, 1/2" inside of the edges. This results in a row of 3 across the flat at the 18" point.
  4. Set flat "A" along its edge, and bend it to fit the parabolic template. Bend a little at a time, working along the length of the metal.
  1. Mark flat "B" across the 15" point, beyond there by a distance equal to the focal distance on the template, and finally 3" beyond the focal distance mark.
  2. Bend flat "B" to a 90 degree angle at the 15" line. Bend flat "B" 90 degrees in the opposite direction at the second mark (representing the focal distance). Flat "B" should now have a right angled "Z" shape.
  3. Use the hacksaw to cut flat "B" at the third mark.

linear focus parabolic wifi antenna

Flat "B" on template.


  1. Mark across flat "B" at 7 1/2" from its long end (halfway to its first bend)
  2. Clamp flat "A" onto the outside of flat "B" such that the three holes in the middle of "A" are on the centerline of "B" AND the middle hole in "A" is on the 7 1/2" mark on "B"
  3. Make sure "A" and "B" are perfectly perpendicular and positioned as specified above, then drill through the existing holes an and into "B." "B" will then have three holes through its centerline that match the holes in "A." Set "B" aside during step 11.

linear focus parabolic wifi antenna

Note how "A" and "B" are bolted together.


  1. Clamp the flashing onto "A" along the inside of the curve, carefully along the center lines, and drill through the existing holes near the ends of "A," making holes in the flashing. Insert the short screws through the flashing and "A." Apply nuts and tighten securely.

YOU SHOULD NOW HAVE A PARABOLIC REFLECTOR WITHOUT A MOUNT


  1. Carefully drill through the existing holes in the center of "A," making 3 vertical holes in the center of the flashing, 1/2" apart.
  2. Place "B" against back of "A," with the Z bend extending under reflector and toward focal line. Line up the 3 holes and insert long screws through reflector, "A," and "B." Apply nuts and tighten securely.

YOU SHOULD NOW HAVE A PARABOLIC REFLECTOR that can accommodate a USB wifi adapter along thefocal line.Mount the assembled reflector and adapter in a window, on a balcony, or wherever there is a line of sight path to the desired wifi access point.

For best performance, consider using a biquad feed. Other choices include using a colinear dipole, or using a 6" length of PVC to place a USB wifi adapter in front of the reflector.An alternative for systems notneeding huge amounts of gain isthe very simple - and smaller - linear parabolic on binarywolf.com. It enables extended range 802.11 connections better than the dipoles supplied with a lot of equipment.



Tags: wi fi booster, wifi extender, wifi antenna, parabolic antenna

©2005 - 2020 AB9IL, All Rights Reserved.
About, Contact, Privacy Policy and Affiliate Disclosure, XML Sitemap.