Tough to mine the roads, and the question is how many of the bomber boys, just drive across or come on the bus? I suspect more than come through the desert. How about closing the border? Forcing the bombers overland, and giving surveillance a chance. Any illegal border crossing, is death. One must also consider there is a Turkish border, a SA border, an Iranian border, a Kuwaiti border, an air border and a sea border. Must be a quagmire in there somewhere.
AC-130 gunships (lots of them)in constant patrol of the borders....just annhilate anything that moves along the borders. It's really quite simple, and they can do it from 10,000 feet.