Extra exam question E9H04

WhyAn electrostatic shield around a small-loop direction-finding antenna eliminates unbalanced capacitive coupling to its surroundings, improving the depth of its nulls. An electrostatic shield around a small-loop direction-finding antenna eliminates unbalanced capacitive coupling between the loop and its surroundings, coupling that would otherwise distort the loop's pattern and shallow out its nulls, so shielding it improves how deep and sharp those nulls actually are, answer B. It doesn't add capacitive loading to widen bandwidth, doesn't address out-of-band tracking errors, and doesn't improve signal strength through better feed line matching, none of those is what an electrostatic shield is there to do.