You might consider making a 2-driven element 40M beam, a-la HB9CV, or
CAL-AV's 2D-40. You'll get a much better front to rear ratio, a much
shorter boom, and the resonance (of the CAL-AV) will be up at 24+ MHz.
The model for the 2D-40 will be published on the web in a couple of weeks.
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