Antennas and typical applications — match each antenna to a communication system List I (Antenna) A. Turnstile (crossed dipole) B. Yagi–Uda array C. Parabolic dish D. Vertical mast (monopole) List II (System) 1. Radar 2. TV transmission (broadcast) 3. MW (medium-wave) broadcasting (AM) 4. TV reception

Introduction / Context:
Different antenna geometries serve different radiation patterns and gains. Matching common antennas to their typical system roles builds intuition for link budgets and coverage.

Given Data / Assumptions:

• Turnstile: omnidirectional/horizontal coverage for VHF broadcast.
• Yagi–Uda: high gain, directional receiving array widely used by TV households.
• Parabolic dish: very high gain/narrow beam used for radar and satellite links.
• Vertical mast: monopole used for AM medium-wave broadcasting.

Concept / Approach:
Associate each antenna’s pattern/gain with the system requirement: broadcast coverage, receive gain, precision beam pointing, or ground-wave coverage at MW.

Step-by-Step Solution:

Verification / Alternative check:
Broadcast engineering texts and practical installations show turnstile arrays on TV towers, Yagi arrays on rooftops, dishes on radar sites and satellite earth stations, and tall vertical masts at AM broadcast sites.

Why Other Options Are Wrong:

• Swapping Yagi with dish misstates the very different gains/beamwidths involved.
• Assigning vertical masts to radar ignores the need for pencil beams.

Common Pitfalls:
Assuming “any antenna works anywhere”—pattern and polarization are decisive.

Final Answer:
A-2, B-4, C-1, D-3