In my opinion there are now two breeds of fox.
The Country fox, who is wary of humans and generally only moves at night but preferably not near humans. They are getting bolder now that there are far less shooters with the tight legislation and no fox hunts. So they do go out during the day. Very difficult to trap and respond to male urine along the boundary. In our case it means they didn't come during the day, but still came at night, despite the urine. However all that changed Christmas Eve when one entered 50 yards away and killed two chickens in broad daylight.
The Urban fox. Afraid of nothing except large dogs. They eat cats given the chance and will wander into your garden fearless of humans and help themselves to your chickens, right under your nose. So confident of their own safety, they are easily trapped. Usually then released into the countryside they are quickly shot by some irate farmer protecting his livestock.
So if you live near a town forget urine, it won't work. If you live in the Country, don't rely too heavily on urine as the next fox may be an Urban release.