Of the 227 countries I have worked on satellite my most memorable one was with HC8/XE1KK (Galapagos) on UO-14. UO-14 was a single channel FM bird with an altitude of about 800 km.
The distance from my QTH to there is 3277 miles which by itself is no record.
I had worked Ramon on 10 meters and I mentioned I spent most of my time on satellites. He immediately came back saying he was working sats from there and he would love a contact with me. I looked at Instant Track and found we had a mutual window for about 3 minutes the next day with a max elevation of about 3 degrees for each of us.
As well the path would be over North America in the afternoon with lots of activity for QRM.
I didnt have much hope I would hear him let alone make an exchange. However we managed to do just that. I have his card dated 27 Mar 2002
Clare VE3NPC