An antenna is made up of several elements that work together. They transfer energy back and forth between each other before the feed-line finally absorbs it. If one element is removed, the drop in performance is usually much worse than the decline in the element total would suggest.
The manufacturers can get very creative when it comes to counting the elements. Dipoles in an LPDA are usually counted as two elements. Sometimes each rod in a reflecting plane is counted as one. Real antenna people never do these things.
Elements
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