Advanced Qualification · A-007 Feedlines and matching · A-007-007-010
Why can a horizontal antenna closer to ground be advantageous for close range communications on lower HF bands?
- A The ground tends to act as a reflector
- B Lower antenna noise temperature
- C Low radiation angle for closer distances
- D The radiation resistance is higher
Correct answer: A — The ground tends to act as a reflector. From the official ISED question bank, verified word for word.
Why
When a horizontal antenna sits low to the earth, the ground acts like a mirror, reflecting radio waves upward to combine with the direct signal. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.