Well, I have never used the fox urine as a cover scent, but you would think that it would not scare them off. I always use coon urine and I know that it does not scare them off or the foxes. Last year I had two foxes come within 6 ft of me in my cedar blind, they never new I was there(a human that is).
If Mr. Bucko feeds at the cornfield, he will be back. You just need to be sure and be there when he returns. (and be ready)<img src=icon_smile_tongue.gif border=0 align=middle><img src=icon_smile_wink.gif border=0 align=middle>

The best of luck in all your hunting endeavors!!!

God Bless,
Dave