MW DX, short for mediumwave DXing, is the hobby of receiving the reception of distant mediumwave (known as AM in North America) radio stations. MW DX is similar to TV and FM DX in that broadcast band (BCB) stations are the reception targets. However, the nature of the lower frequencies (520 - 1710 kHz) used by mediumwave radio stations is very much different from that of the VHF and UHF bands used by FM and TV broadcast stations, and therefore involves different receiving equipment, signal propagation, and reception techniques.
Read more about MW DX: Propagation, MW DX in North America, MW DX in Europe, Equipment