Web Design

Multi-band Dipole

This article is a work in progress

At the most basic level, it is important to decide upon the frequency coverage you want to achieve. I opted to construct this antenna for coverage of 40m, 20m and 10m. This description will not discuss dipole calculations and it is accepted that the reader is familiar with basic dipole construction and tuning techniques.


  1. 3 X Eye Bolts 6 mm thread or equivalent
  2. 6 X Washers 6 mm X 30 mm X 1.5 mm
  3. 3 X 6 mm Nuts
  4. 1 X PVC Box
  5. 2.5 mm PVC coated electrical wire
  6. 6 X lugs
  7. 1 X U bolt suitable for mast diameter
  8. 1 X Cable tie
  9. Strip of connector block (enough to cut 6 x 2)
  10. 2 X Insulators
  11. 6 m 20 mm PVC pipe cut into sections of 40 cm each
  12. Binding wire

Drill the holes for the eye-bolts and fit them with a large washer on either side of the PVC housing and secure using the 6 mm nuts.  Cut your first dipole, remember to make it slightly longer to allow for tuning. It is important to begin with the 40m dipole as this one needs to be tuned first. Attached one end of each wire as illustrated above and connect the RG58 coax which should be terminated with the appropriate plug compatible with your transceiver. Remember to feed the coax through the eye-bolt that will act as strain reliever and secure with a cable tie.


Slip the end of each dipole through the block connector (refer to next image).  This allows the dipole to be tuned without cutting the wire. Attach the PVC box to the mast, raise and tune the dipole using a suitable SWR meter for lowest SWR on desired center frequency. Next attach the dipoles for 20 m and repeat the process.  Remember to recheck the SWR of the 40 m dipole and adjust as needed. Finally attach the dipole for 10m and repeat the process, checking the SWR of the 40m and 20 m dipole.


Drill three holes spaced 40mm through each of the PVC pipes. These will act as separators for the dipoles.  Remove the connector blocks (the screws having bitten into the PVC coating will indicate the last setting and fit the spacers. Bind the spacers to the dipole elements and re-fit the connector blocks. Check SWR again and make final adjustments.

The same approach may be taken when building a multi band dipole for 30m and 15 m. Do not be tempted to add a 30 m or 15 m dipole to the 40 m to 10 m version. There is sufficient literature on the web explaining why this is a bad idea.


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