The best replacement for gable vents is ridge vents.

The best alternatives to gable vents are rated as following:
★★★★★  ridge vents
★★★  soffit vents
★★  roof vents

Your alternative for gable vents is not listed? Suggest!
Speaking about gable vents, one probably shouldn't forget about ridge vents.

Other search terms related to gable vents and their ratings are:
★★★★★ ridge vents
★★ soffit vents
★ roof vents
★ ridge vent
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Google Trends

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gable vents
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