We would detonate an EMP approximately 6 feet above street level in Tehran. That ought to do in the 2 or 3 radios and a couple of TVs they have.
If the Iranians will consider the option of using that bomb against the U.S. it will likely scare all Arabs in the Middle East... because America's retaliation will be against them all except Israel.. but i dont know how will America avoid Israel getting hit.