Homemade 3G Antenna

Written by marshal m. rosenthal
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Homemade 3G Antenna
(David Sacks/Lifesize/Getty Images)

A cell phone that uses the 3G cellular network can benefit from the increase in signal strength of an external antenna. A homemade 3G antenna can be made from a few supplies from a hardware store and a universal cellular antenna acquired from a hobby shop. A few tools common to most homes will be needed as well.

Skill level:

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Things you need

  • GSM antenna
  • Pliers
  • Wire cutters
  • Soldering iron
  • Wire strippers
  • Ruler
  • 12-gauge electric wire
  • Utility knife
  • Double-sided tape
  • Cell phone holder

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  1. 1

    Stand a universal cellular reception antenna, called a "GSM" antenna, on a work surface. Unscrew the antenna rod from the bottom of the GSM antenna with your fingers. Pull the antenna rod off so as to leave the vertical wire inside untouched. Place the antenna rod aside.

  2. 2

    Grip the base of the antenna rod with the pliers. Twist the pliers to pull the antenna feeder plate off the bottom of the antenna.

  3. 3

    Snip the vertical wire off the bottom of the antenna feeder plate with the wire cutters. Place the wire aside.

  4. 4

    Heat up the soldering iron for five minutes. Strip a half inch of insulation from both ends of the electric wire. Solder one of the exposed ends of the electric wire to the centre contact on the antenna feeder plate where the wire was previously located. Let the solder cool for a minute before continuing.

  5. 5

    Cut a hole in the back of a cell phone holder at the location that matches where the cell phone's interior antenna is located with the blade of the utility knife. This information can be gleaned from the phone's website or the instruction manual. Smooth out the inside edges of the hole with the blade.

  6. 6

    Push the two wires attached to the antenna feeder plate through the hole in the cell phone holder from the inside.

  7. 7

    Place a strip of double-sided tape on the bottom of the antenna feeder plate. Press the antenna feeder plate against the cell phone holder so that the tape takes hold.

  8. 8

    Solder the exposed end of the free wire to one end of the wire that was previously attached to the antenna feeder plate. Let the solder cool for a minute.

  9. 9

    Hold the wire vertically with the soldered end facing down. Solder the bottom of the wire to the bottom of the GSM antenna. Let the solder cool for a minute. Place the antenna rod back over the wire and up against the bottom of the GSM antenna. Screw the antenna rod back on the GSM antenna.

  10. 10

    Place the 3G cell phone into the cell phone holder. Stand the GSM antenna as far away from the phone as the wiring will allow. Place a call to use your homemade 3G antenna with the cell phone.

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