The sorely underrated George Harrison asked “What is Life?” Many dxers ask “What is DX?” Some band II dxers don’t consider anything under 1100 km via Tropo to be DX. To be honest I don’t really consider WBBR on 1130 kHz or France Bleu Nord on 94.7 Mhz to be DX. However I do consider my tropo reception on 23 September of Virgin Radio Montreuil/le Bois-de-Sel on 87.9 MHz to be DX despite the transmitter location being only 181 km from me.
My definition of DX is very simple – DX is “unusual reception at your QTH with your equipment”. Hence with my Perseus SDR/Flag I would expect to hear WBBR if the propagation is there. Likewise France Bleu Nord with the Sony XDR and Triax FM7. For another dxer living next door in London with a Tecsun portable and long wire, receiving WBBR would be DX and receiving France Bleu on the telescopic would be DX. Receiving Virgin on 87.9 was DX for me as it is vertically polarised, low power and my antenna is horizontal and it is normally not present even assuming the frequency is clear.