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  • CQ Amateur Radio

    A Simple Dual-Band Upgrade for Your 40-Meter Dipole

    Dec 01, 2020 4 minutes
    BY BOB GLORIOSO,* W1IS AND BOB ROSE,# KC1DSQ

    During this lull in the solar cycle, 40 meters has been the best band for both local and DX contacts. Now that the sunspots are coming, other bands will soon be packed with signals as well. If you have a 40-meter dipole that’s been your workhorse through the lull between Cycles 24 and 25, this will get you on 15 meters with low SWR and a minimum of effort.

    Theory

    You may recall that dipoles work well on their odd harmonics, so a 40-meter dipole should—in theory—work well on 15 meters, a great DX band. However, if your antenna is tuned to the middle of the

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