QSL card
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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
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.
QSL card.
DXing
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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
QSL card
…however, AM broadcasting radio stations will often reply to listener reports, particularly if they report receiving them at a significant distance. DXing Heys Collection, a collection of QSL cards in the British Library Philatelic Collections…
QSL card from Voice of America