I'm taking my commercial check ride soon and I'd like to make sure I know enough about the airplane.  Picture #1, I believe are Comm and Nav, which one is which? Picture #2, there is one on each side of the front gear door, is that an antenna? Picture #3, I'm not to sure what that is for, I know the two GPS looking antennas on top are for the GPS and Aspen. Also, the two flat things on the upper part of the tail, is that for airflow? Thanks!