What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?

1. A Cardioid
2. B Omni-directional
3. C A figure-eight broadside to the axis of the array
4. D A figure-eight oriented along the axis of the array

What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?

1. A Cardioid
2. B A figure-eight end-fire along the axis of the array
3. C A figure-eight broadside to the axis of the array
4. D Omni-directional

What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed in phase?

1. A Omni-directional
2. B Cardioid
3. C A figure-eight broadside to the axis of the array
4. D A figure-eight end-fire along the axis of the array

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

1. A Fewer lobes form with the major lobes increasing closer to broadside to the wire
2. B Additional lobes form with major lobes increasingly aligned with the axis of the antenna
3. C The elevation angle increases, and the front-to-rear ratio decreases
4. D The elevation angle increases, while the front-to-rear ratio is unaffected

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

1. A To create a similar feed point impedance on multiple bands
2. B To suppress off-center lobes at higher frequencies
3. C To resonate the antenna across a wider range of frequencies
4. D To reduce common-mode current coupling on the feed line shield

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

1. A It reflects the standing waves on the antenna elements back to the transmitter
2. B It changes the radiation pattern from bidirectional to unidirectional
3. C It changes the radiation pattern from horizontal to vertical polarization
4. D It decreases the ground loss

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

1. A 300 ohms
2. B 72 ohms
3. C 50 ohms
4. D 450 ohms

What is a folded dipole antenna?

1. A A dipole one-quarter wavelength long
2. B A center-fed dipole with the ends folded down 90 degrees at the midpoint of each side
3. C A half-wave dipole with an additional parallel wire connecting its two ends
4. D A dipole configured to provide forward gain

Which of the following describes a G5RV antenna?

1. A A wire antenna center-fed through a specific length of open-wire line connected to a balun and coaxial feed line
2. B A multi-band trap antenna
3. C A phased array antenna consisting of multiple loops
4. D A wide band dipole using shorted coaxial cable for the radiating elements and fed with a 4:1 balun

Which of the following describes a Zepp antenna?

1. A A horizontal array capable of quickly changing the direction of maximum radiation by changing phasing lines
2. B An end-fed half-wavelength dipole
3. C An omni-directional antenna commonly used for satellite communications
4. D A vertical array capable of quickly changing the direction of maximum radiation by changing phasing lines

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

1. A Radiation at low angles decreases
2. B Additional lobes appear at higher elevation angles
3. C Separate elevation lobes will combine into a single lobe
4. D Radiation at low angles increases

Which of the following describes an extended double Zepp antenna?

1. A An end-fed full-wave dipole antenna
2. B A center-fed 1.5-wavelength dipole antenna
3. C A center-fed 1.25-wavelength dipole antenna
4. D An end-fed 2-wavelength dipole antenna

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

1. A The takeoff angle of the lowest elevation lobe increases
2. B The takeoff angle of the lowest elevation lobe decreases
3. C The horizontal beamwidth increases
4. D The horizontal beamwidth decreases

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

1. A The main lobe takeoff angle increases in the downhill direction
2. B The main lobe takeoff angle decreases in the downhill direction
3. C The horizontal beamwidth decreases in the downhill direction
4. D The horizontal beamwidth increases in the uphill direction