DXing, taken from DX, the telegraphic shorthand for "distance" or "distant", is the hobby of receiving and identifying distant radio or television signals, or making two-way radio contact with distant
A QSL card is a written confirmation of either a two-way radiocommunication between two amateur radio or citizens band stations; a one-way reception of a signal from an AM radio, FM radio, television
DXing
…radio or other two-way radio communications. Many DXers also attempt to obtain written verifications of reception or contact, sometimes referred to as "QSLs" or "veries". The practice of DXing arose during the early days of radio broadcasting. Listeners would mail "reception reports" to radio broadcasting…
A 1925 QSL card from amateur radio operator Bill Corsham, G2UV.
QSL card from Syd Preiss, Nairne, South Australia to VK3BQ Max Howden. Many shortwave listeners printed their own QSL cards to report reception.
QSL card confirming listener reception of AM radio station KXEL in Waterloo, Iowa.