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It's so strange that almost every good FM antenna is out of production.
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For the same reason that you can't find buggy whips in production anymore - lack of demand.
You should be consulting the reference in post #2, not the stagger stacking reference. There is math that you must do, otherwise you're just wasting time and resources. Also see
http://www.kyes.com/antenna/stackluge.html
A correctly done stack will offer up to a 2.5 dB gain AT ONE FREQUENCY only. It will not offer that benefit across the entire band and will most likely have some detrimental effects at frequencies away from the peak.
Typical stacking distance is between 2/3rds and .94 wavelength.