The distance between the centers of the conductors and the radius of the conductors
The distance between the centers of the conductors and the length of the line
The radius of the conductors and the frequency of the signal
The frequency of the signal and the length of the line

25 and 30 ohms
50 and 75 ohms
80 and 100 ohms
500 and 750 ohms

50 ohms
75 ohms
100 ohms
300 ohms

Operating an antenna at its resonant frequency
Using more transmitter power than the antenna can handle
A difference between feedline impedance and antenna feed point impedance
Feeding the antenna with unbalanced feedline

The antenna feed point must be at DC ground potential
The feedline must be cut to an odd number of electrical quarter wavelengths long
The feedline must be cut to an even number of physical half wavelengths long
The antenna feed point impedance must be matched to the characteristic impedance of the feedline

To increase the radiation resistance
To reduce spurious emissions
To match the unbalanced transmitter output to the balanced parallel conductor feedline
To reduce the feed-point impedance of the antenna

It is independent of frequency
It increases
It decreases
It reaches a maximum at approximately 18 MHz

ohms per 1000 ft
dB per 1000 ft
ohms per 100 ft
dB per 100 ft

4:1
1:4
2:1
1:2

2:1
50:1
1:5
5:1

2:1
1:1
50:50
0:0

2:1
2.5:1
1.25:1
You cannot determine SWR from impedance values

1.5:1
3:1
6:1
You cannot determine SWR from impedance values

1 to 1
5 to 1
Between 1 to 1 and 5 to 1 depending on the characteristic impedance of the line
Between 1 to 1 and 5 to 1 depending on the reflected power at the transmitter

It must be longer than 1 wavelength
You may experience RF burns when touching metal objects in your station
It produces only vertically polarized radiation
It is not effective on the higher HF bands

They lower the radiation angle
They bring the feed-point impedance closer to 300 ohms
They increase the radiation angle
They can be adjusted to bring the feed-point impedance closer to 50 ohms

It decreases
It increases
It stays the same
It reaches a maximum at an angle of 45 degrees

It is a figure-eight at right angles to the antenna
It is a figure-eight off both ends of the antenna
It is a circle (equal radiation in all directions)
It has a pair of lobes on one side of the antenna and a single lobe on the other side

If the antenna is too high, the pattern becomes unpredictable
Antenna height has no effect on the pattern
If the antenna is less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectional
If the antenna is less than 1/2 wavelength high, radiation off the ends of the wire is eliminated

As high as possible above the ground
Parallel to the antenna element
On the surface or buried a few inches below the ground
At the top of the antenna

It steadily increases
It steadily decreases
It peaks at about 1/8 wavelength above ground
It is unaffected by the height above ground

It steadily increases
It steadily decreases
It peaks at about 1/8 wavelength from the end
It is unaffected by the location of the feed-point

Lower ground reflection losses
Lower feed-point impedance
Shorter Radials
Lower radiation resistance

8.2 feet
16.4 feet
24.6 feet
32.8 feet

42.2 feet
84.5 feet
131.8 feet
263.6 feet

8.2 feet
10.5 feet
16.4 feet
21.0 feet

Use larger diameter elements
Use closer element spacing
Use traps on the elements
Use tapered-diameter elements

1/4 wavelength
1/2 wavelength
3/4 wavelength
1 wavelength

The reflector is normally the shortest parasitic element
The director is normally the shortest parasitic element
The driven element is the longest parasitic element
Low feed-point impedance increases bandwidth

The reflector is normally the longest parasitic element
The director is normally the longest parasitic element
The reflector is normally the shortest parasitic element
All of the elements must be the same length

Gain increases
SWR increases
Weight decreases
Wind load decreases

It provides excellent omnidirectional coverage in the horizontal plane
It is smaller, less expensive and easier to erect than a dipole or vertical antenna
It helps reduce interference from other stations to the side or behind the antenna
It provides the highest possible angle of radiation for the HF bands

The number of directors versus the number of reflectors
The relative position of the driven element with respect to the reflectors and directors
The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction
The ratio of forward gain to dipole gain

The magnitude of the maximum vertical angle of radiation
The point of maximum current in a radiating antenna element
The maximum voltage standing wave point on a radiating element
The direction of maximum radiated field strength from the antenna

9.7 dBi
7.3 dBd
5.4 times the gain of a dipole
All of these choices are correct

The physical length of the boom
The number of elements on the boom
The spacing of each element along the boom
All of these choices are correct

To match the relatively low feed-point impedance to 50 ohms
To match the relatively high feed-point impedance to 50 ohms
To increase the front to back ratio
To increase the main lobe gain

Support the driven element with ceramic standoff insulators
Insert a high impedance transformer at the driven element
Insert a high voltage balun at the driven element
None of these answers are correct. No insulation is needed

1/4 wavelength
1/2 wavelength
3/4 wavelength
1 wavelength

2/3
About the same
3/2
Twice

Slightly less than 1/4 wavelength
Slightly more than 1/4 wavelength
Slightly less than 1/2 wavelength
Slightly more than 1/2 wavelength

3 dB higher
3 dB lower
2.54 dB higher
About the same

1/4 wavelengths
1/3 wavelengths
1/2 wavelengths
2/3 wavelengths

A collinear array
A rhombic antenna
A double-extended Zepp antenna
A Yagi antenna

A stacked dipole array
A collinear array
A cubical quad antenna
An Adcock array

The polarization of the radiated signal changes from horizontal to vertical
The polarization of the radiated signal changes from vertical to horizontal
The direction of the main lobe is reversed
The radiated signal changes to an omnidirectional pattern

The driven element must be fed with a balun transformer
The driven element must be open-circuited on the side opposite the feed-point
The reflector element must be approximately 5% shorter than the driven element
The reflector element must be approximately 5% longer than the driven element

Nearly Vertical Inductance System
Non-Visible Installation Specification
Non-Varying Impedance Smoothing
Near Vertical Incidence Skywave

Low vertical angle radiation for DX work
High vertical angle radiation for short skip during the day
High forward gain
All of these choices are correct

As close to one-half wave as possible
As close to one wavelength as possible
Height is not critical as long as significantly more than 1/2 wavelength
Between 1/10 and 1/4 wavelength

Approximately 1.5 dB higher
Approximately 3 dB higher
Approximately 6 dB higher
Approximately 9 dB higher

Allows quick selection of vertical or horizontal polarization
Allows simultaneous vertical and horizontal polarization
Narrows the main lobe in azimuth
Narrows the main lobe in elevation

Wide bandwidth
Higher gain per element than a Yagi antenna
Harmonic suppression
Polarization diversity

Length and spacing of the elements increases logarithmically from one end of the boom to the other
Impedance varies periodically as a function of frequency
Gain varies logarithmically as a function of frequency
SWR varies periodically as a function of boom length

Its impedance is too low for effective matching
It has high losses compared to other types of antennas
It has poor directivity
All of these choices are correct

Directional transmitting for low HF bands
Directional receiving for low HF bands
Portable Direction finding at higher HF frequencies
Portable Direction finding at lower HF frequencies

A vertical antenna constructed from beverage cans
A broad-band mobile antenna
A helical antenna for space reception
A very long and low receiving antenna that is highly directional

They present low impedance on all design frequencies
They must be used with an antenna tuner
They must be fed with open wire line
They have poor harmonic rejection

To permit multiband operation
To notch spurious frequencies
To provide balanced feed-point impedance
To prevent out of band operation