WSPR & DXCC (qrp)

On Wednesday I had the whole day WSPR on 10M running. During this time I heard no signals from other WSPR stations. My signal was heard by 2 stations for a period.
PAøO heard my signal over a distance of 172km. What kind of propegation was this?

Every second Wednesday of the month we have a meeting with local radio amateurs in this area. During this evening the QSL manager of R30 is also present.
This time there where some QSL for me to. The card of UA9CSA jumped out for me.
This is a qso I made with my homemade Rockmite with a power of approximately 300mW. The confirmation of this QSO made the confirmed DXCC countries with QRP on 52.

73, Tjeerd (Gose) - PA3GNZ