I've heard that wind pollination is how the sea buckthorn is pollinated, but I plan to put the trees crosswind. would this work for proper pollination of all plants?
As sea buckthorn tends to get large, most sources discuss minimum distance... ^_^
I personally would be a bit wary of that first claim - I guess 50m if the female plant is downwind from the male and wind speed is usually high and I have never seen insects at my blooming sea buckthorn, neither male nor female.
One reassuring fact, though: ours are planted exactly the wrong direction1 and still we got enough berries for about a pint of jam from just one young female plant (ca. 1.80m / 6 ft high). The nice thing about wind is that it usually does not blow from exactly one direction but shifts and the air moves in different directions. And a male plant releases a lot of pollen: on a sunny spring day you can sometimes observe a real "cloud" of it billowing around.
If planting totally cross-wind, I would probably put the male plant in the center of the row, not at the end.
1 We tried to plant it correctly, but our nursery had them mixed up. Unless they are blooming or fruiting, you can't really distinguish the plants. And by the time they bloomed the year after planting, they were so firmly rooted, that we let them be, opting to plant a second male on the other side of the row if necessary. (Apparently not...)