When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?

1. A Its overall length must not exceed 1/4 wavelength
2. B It must be mounted more than 1 wavelength above ground
3. C It should be configured as a four-sided loop
4. D It should be at least one wavelength long

Which is generally true for 160- and 80-meter receiving antennas?

1. A Atmospheric noise is so high that directivity is much more important than losses
2. B They must be erected at least 1/2 wavelength above the ground to attain good directivity
3. C Low loss coax transmission line is essential for good performance
4. D All these choices are correct

What is receiving directivity factor (RDF)?

1. A Forward gain compared to the gain in the reverse direction
2. B Relative directivity compared to isotropic
3. C Relative directivity compared to a dipole
4. D Peak antenna gain compared to average gain over the hemisphere around and above the antenna

What is the purpose of placing an electrostatic shield around a small-loop direction-finding antenna?

1. A It adds capacitive loading, increasing the bandwidth of the antenna
2. B It eliminates unbalanced capacitive coupling to the antenna's surroundings, improving the depth of its nulls
3. C It eliminates tracking errors caused by strong out-of-band signals
4. D It increases signal strength by providing a better match to the feed line

What challenge is presented by a small wire-loop antenna for direction finding?

1. A It has a bidirectional null pattern
2. B It does not have a clearly defined null
3. C It is practical for use only on VHF and higher bands
4. D All these choices are correct

What indicates the correct value of terminating resistance for a Beverage antenna?

1. A Maximum feed point DC resistance at the center of the desired frequency range
2. B Minimum low-angle front-to-back ratio at the design frequency
3. C Maximum DC current in the terminating resistor
4. D Minimum variation in SWR over the desired frequency range

What is the function of a Beverage antenna's termination resistor?

1. A Increase the front-to-side ratio
2. B Absorb signals from the reverse direction
3. C Decrease SWR bandwidth
4. D Eliminate harmonic reception

What is the function of a sense antenna?

1. A It modifies the pattern of a DF antenna to provide a null in only one direction
2. B It increases the sensitivity of a DF antenna array
3. C It allows DF antennas to receive signals at different vertical angles
4. D It provides diversity reception that cancels multipath signals

What type of radiation pattern is created by a single-turn, terminated loop such as a pennant antenna?

1. A Cardioid
2. B Bidirectional
3. C Omnidirectional
4. D Hyperbolic

How can the output voltage of a multiple-turn receiving loop antenna be increased?

1. A By reducing the permeability of the loop shield
2. B By utilizing high impedance wire for the coupling loop
3. C By increasing the number of turns and/or the area enclosed by the loop
4. D All these choices are correct

What feature of a cardioid pattern antenna makes it useful for direction-finding antennas?

1. A A very sharp peak
2. B A single null
3. C Broadband response
4. D High radiation angle