Discussion
Why is a range's source antenna usually directive?
Answer: D
Directing the source at the test antenna puts less energy on the floor, walls and range structure, so the reflected paths that corrupt the measurement are weaker. It must not be so directive that the illumination across the test aperture becomes uneven, which is the competing requirement. Field strength is a secondary benefit, polarisation is set by orientation, and the far field distance depends on the aperture sizes. Every range design balances taper against stray illumination.
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