I want to know the answer to the following question:
What must be precise in order to create this signal at output?
All the background I'm provided with is that "The antenna array and very similar reflective array antenna consist of multiple elements, often half-wave dipoles, spaced out on a plane and wired together with transmission lines with specific phase lengths to produce a single in-phase signal at the output.". Is that enough to answer the question?
Answer: yes