426: A vertical, ground plane antenna works, for DX contacts.  

427: A vertical (ground plane) antenna radiates in what degree of direction?

428: When may a licensed amateur radio operator be paid for operating an amateur radio station?

429: "England's ARRL," the RSGB, stands for what?  

430: In what year did Marconi first span the Atlantic with wireless communications?  

431: If another amateur operator requests a QSL card, you must respond by sending your QSL.

432: Over long distances, a signal transmitted from a vertical antenna will not be received well on a dipole antenna.

433: In the past, the FCC required all amateur operators to keep a "station log."

434: To be a member of the ARRL "Old Timer's Club," you must have had an amateur radio operator license continually for at least 20 years.

435: If you qualify for DXCC (DX Century Club), you would automatically also qualify for WAZ (Worked All Zones).

436: It is possible to receive an "RST 599" report, and still have a "chirp" on your CW signal.

437: A likely cause of a "chirp" on a CW signal could be caused by insufficient voltage to the transmitter.  

438: An FCC-licensed amateur radio operator cannot have an additional amateur radio license issued by a foreign country.

439: In the past, the FCC required an amateur radio operator to apply for a new callsign, if he/she moved to another USA call district.

440: If a Hawaiian or Alaskan ham moved to the mainland United States, and was working towards DXCC, he/she would need to "start over" for DXCC.    

441: For an EME (earth-moon-earth, or "moonbounce") transmission, the best position for the moon to be in is:  

442: The "OO" (Official Observer) program is an auxiliary to whom?  

443: The United Nations amateur radio station can be counted as "New York" for the WAS (Worked All States) award.

444: A QSO with an ocean-going vessel, anchored in the territorial waters of Russia, can be counted as a DXCC contact with Russia.

445: If an amateur operator receives an "Advisory Notice" from an "Official Observer" (OO) station, the operator must send a written explanation to the OO within 10 days.  

446: A VE with a lower class license may be part of a VE team in an exam for a higher class license, as long as at least one of the VE team has the appropriate class license.

447: "Cosmos-RS" and "Cosmos-VHF", awards of The Central Radio Club of Russian Federation, are issued for QSOs made via amateur radio satellites. What event are this awards devoted to?  

448: The callsigns with 4K1 prefixes belonged to Azerbaijan now. What radio stations, from the former Soviet Union, did use 4K1 callsigns before 1993?  

449: Marconi was awarded the Nobel prize. In what year did this occur?  

450: The 1972 ARRL Handbook states Watts PEP output limits for both day, and night.