I made several OCF antenna's from it for other ham's never got complaints.
It won't rust ;)
The resistance might be a bit higher, but the loss of 1 or 2 watts is negligable on 100 watts.
Some tried side by side tests, nobody could hear a fraction of a difference.
The stainless steel wire i used was one strand of 316 type welding wire, 1/20 th of an inch and a full size OCF for 80 -10