I want to know the answer to the following question:
What can take advantage of these elements to add more gain?
All the background I'm provided with is that "However, this also makes it increasingly sensitive to changes in frequency; if the signal frequency changes, not only does the active element receive less energy directly, but all of the passive elements adding to that signal also decrease their output as well and their signals no longer reach the active element in-phase.". Is that enough to answer the question?
Answer: no