1. Make the antenna as long as you can; each of the two segments should be exactly half the total length

2. Raise the antenna as high as you can, ideally one-half wavelength of the lowest band you'll be using (e.g. 33 feet for 20m)

3. The antenna’s ends can be at the same height as its feed point, or they can droop down, but keep them at least 10 feet off the ground to avoid contact with people

4. Keep the feedline at least 1 inch away from metal

5. Start with feedline longer than you need, as you may need to trim it (see step 8 below)

6. Ideally, use a balanced antenna tuner; otherwise, use an antenna tuner with a balun

• Balanced antenna tuners

• Ameritron ATR-10 (only available "used", e.g. from eBay or at Hamfests)

• Emtech ZM-2

• Johnson Matchbox (275 watt and 1 kilowatt versions are only available "used", e.g. from eBay or at Hamfests)

• MFJ-974HB

• Palstar BT1500A

• Antenna tuners with a built-in balun

• Ameritron ATR-20

• Ameritron ATR-30

• MFJ-901B

• MFJ-902

• MFJ-904

• Palstar AT-500

7. If your unbalanced antenna tuner, doesn't include a built-in balun, you can add one:

• Homebrew: an inexpensive medium power tuner current balun for HF

• Commercial:

  • Balun Designs ATU current balun

  • LDG RBA-1:1 Balun (current balun)

8. Initial configuration

1. Adjust the antenna tuner for acceptable SWR on each band, starting with the highest frequency band you use, and jotting down the settings for each band

2. If you can’t achieve a reasonable SWR on one band, shorten the feedline by 3’, and repeat step 8a

9. Additional Information about the Multi-band Doublet

   • What is a Doublet Antenna?

   • Introducing the "All-Band" Doublet (L. B. Cebik, W4RNL)

   • All -Band Doublet (L. B. Cebik, W4RNL)

   • Suppose I Could Only Have One Wire Antenna (L. B. Cebik, W4RNL)

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