E9D - Antennas and Transmission Lines

How much does the gain of an ideal parabolic reflector antenna increase when the operating frequency is doubled?

How can two linearly polarized Yagi antennas be used to produce circular polarization?

What is the most efficient location for a loading coil on an electrically short whip?

Why should antenna loading coils have a high ratio of reactance to resistance?

Approximately how long is a Yagi’s driven element?

What happens to SWR bandwidth when one or more loading coils are used to resonate an electrically short antenna?

What is an advantage of top loading an electrically short HF vertical antenna?

What happens as the Q of an antenna increases?

What is the function of a loading coil in an electrically short antenna?

How does radiation resistance of a base-fed whip antenna change below its resonant frequency?

Why do most two-element Yagis with normal spacing have a reflector instead of a director?

What is the purpose of making a Yagi’s parasitic elements either longer or shorter than resonance?