QSL Card

From K2CC Wiki

A QSL card is a paper statement 3½ by 5½ inches (8.9cm by 14.0cm) establishing proof of a communication between two amateur radio stations. A QSL card will contain, at minimum, the call signs of both stations communicating, the time and date of the contact (often in UTC), the frequency used for communication, the mode of transmission, and a signal report. Although not necessary, most QSL cards contain a graphic and/or additional information about the operator and/or station from which the card originated.