How To

How to Build a Dipole Antenna

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By eHow Contributing Writer
(23 Ratings)

A dipole antenna offers a new ham operator or shortwave listener a simple, economical means of getting on the air quickly. Adding an antenna tuner allows operation on several frequencies.

Difficulty: Moderate
Instructions

Things You'll Need:

  • 30-foot Aluminum Push-up Pole
  • RG-8X Coax - Ham Radio Supplies
  • Antenna Tuner - Ham Radio Equipment
  • Center Insulator/end Insulators - Ham Radio Accessories
  • Ground Wires
  • 100 Feet Lightweight Nylon Rope
  • 1 Phillips Screwdrivers
  • 1 Electric Drill/assorted Bits
  • 1 Pulley Hooks
  • 1 Pulleys
  • 1 Slotted Screwdrivers
  • 135 Feet Of Copper Wire
  • Cable Ties
  • Electrical Sealants
  • Wire Nippers
  • Wire-insulation Strippers

    Constructing and Erecting the Antenna

  1. Step 1

    Plan the layout for the dipole. Stretch each dipole leg about 65 feet in a straight line if possible.

  2. Step 2

    Determine what support you'll use for the center insulator. A 30-foot TV mast fixed to house eaves serves nicely.

  3. Step 3

    Attach a small pulley to the mast top.

  4. Step 4

    Run a light rope through the pulley.

  5. Step 5

    Erect the mast.

  6. Step 6

    Obtain 135 feet of wire - 14-gauge should suffice. Scrap wire, either bare or insulated, will work fine.

  7. Step 7

    Obtain the center insulator and leg-end insulators.

  8. Step 8

    Cut the wire in half and then trim each each leg to a resonate at a specific frequency if you like.

  9. Step 9

    Attach one end of each leg to the center insulator, coating the connection with silicone sealant.

  10. Step 10

    Attach the other end of each leg to an end insulator.

  11. Step 11

    Attach coaxial feed line to the center insulator and carry the other end to the point at which it will enter your house.

  12. Step 12

    Use cable ties to secure the coax to the house between the mast and the entrance point.

  13. Step 13

    Attach the center insulator to a rope end and pull it to the top of the mast.

  14. Step 14

    Tie the rope to secure it to the support mast.

  15. Step 15

    Select end supports such as trees, fence posts, garage eaves or an existing TV mast.

  16. Step 16

    Stretch out each leg of wire to its end support.

  17. Step 17

    Thread light rope through the opposite side of the end insulators.

  18. Step 18

    Tie the end insulators to the end supports.

  19. Bringing the Feed Line Into the Radio Room

  20. Step 1

    Make certain you have enough coaxial cable to reach the radio room.

  21. Step 2

    Wind up any extra cable and secure it under your radio desk. Extra cable might be necessary if you choose to move the radio.

  22. Step 3

    Find a means of entering the dwelling, such as through a crawl space or gable vent.

  23. Step 4

    Feed the cable from the antenna support mast to the point nearest the radio room.

  24. Step 5

    Drill an adequate hole in the floor or wall.

  25. Step 6

    Feed the cable through the opening.

  26. Step 7

    Attach to the antenna tuner.

  27. Step 8

    Run a separate ground wire (8- or 10-gauge) from the antenna tuner to the ground rod.

  28. Step 9

    Attach the tuner to the radio with a short piece of coax cable.

Tips & Warnings
  • Type RG-8X coax is a good choice as it's relatively narrow in diameter and has a low loss factor.
  • Coax cable can be purchased in specific lengths with connectors attached.
  • Exercise care when drilling through wall panels or flooring.
  • The ground rod and shunt provide a ground for radio frequencies only. The system is not adequate protection against lightning strikes.
  • Always disconnect the antenna system during electrical storms.

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