I powered the rig on 20m CW at 1440Z today. I noticed moderately high atmospheric noise. It was annoying, but not a major hindrance to working strong sigs, but there were no strong sigs from the north-northeast. The band was not fully open to Europe. I copied a DL and a a French station or two. I then contacted a KA3 station operating POTA. The only excitement on the band was from C31CT in Andorra calling CQ. His signal was 339 at best. I tuned away as the band showed little sign of improvement. Near 1600Z I heard A60EXPO (the U.A.E., probably Dubai) calling CQ, and turned my yagi due north. In addition to many EU stations, he worked a very few VE and some W/K stations (but not many). At 1614 he went in my log. Post-QSO, his sig continued to grow, and briefly (minutes) he was 579. He was a skilled operator and kept a good pace. It surprised me that he worked few NA stations, although he called for NA. Propagation was poor but not terrible. Where is this story going? Before breakfast I searched the A6 call on the Reverse Beacon Network for recent hits. I chose to show 100 hits and found 100 skimmer hits between 1525Z and 1641Z. Guess what? There was not one U.S. skimmer hit in that 75 minute window, and only two Canadian hits, both from the same VE2 station. Some RBN stations have superb sensitivity to weak signals; far, far better than my simple station's. It was shocking that while A60EXPO was decent copy here, his sig was invisible to all U.S. RBN contributors. Furthermore, I knew he had worked several W/K and VE stations! I chalk this up to selective propagation, since I find no other explanation.