Extra Class

What happens to the radiation pattern of an unterminated long wire antenna as the wire length is increased?

What is the purpose of feeding an off-center-fed dipole (OCFD) between the center and one end instead of at the midpoint?

What is the effect of adding a terminating resistor to a rhombic or long-wire antenna?

What is the approximate feed point impedance at the center of a two-wire half-wave folded dipole antenna?

What is a folded dipole antenna?

Which of the following describes a G5RV antenna?

Which of the following describes a Zepp antenna?

How is the far-field elevation pattern of a vertically polarized antenna affected by being mounted over seawater versus soil?

Which of the following describes an extended double Zepp antenna?

How does the radiation pattern of a horizontally polarized antenna vary with increasing height above ground?

How does the radiation pattern of a horizontally-polarized antenna mounted above a long slope compare with the same antenna mounted above flat ground?

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?