Hi! Yes, I am applying at UW-Madison this season, and the whole process is pretty nerve-wracking, if you ask me =) I am also an international student, like DBear. That being said, I was actually in Madison during summer semester in 2015, got to talk with a couple profs, not from the Comm Dep though. But I absolutely loved living in Madison, so if you have questions about practicalities or whatnot I'll try my best to answer.
I am also switching from another discipline (polisci), and feeling pretty anxious about it, to be honest. I am applying fresh from undergrad to boot, and need a REALLY good statement to convince them I am serious about research and phd studies.