The most common max power on a new radio is 100 watts, although some of the more expensive radios could have more. With the stock 100 watt radio, depending on atmospheric conditions, your antenna type, and the height of your antenna, you could talk to most all countries, but not on demand. What I mean by demand is that you can't control when you will make each contact, but each day, or night, you may contact some part of the world.
1 In addition to specific course and scholastic average requirements, each candidate for a bachelor's degree from the University of Illinois at Urbana-Champaign must earn at least 60 semester hours of UIUC credit, of which as least 21 hours must be 300- or 400-level courses at this campus (Student Code Art 3-801).
Graduate students requiring certification as full-time students must be enrolled for at least 9 credit hours during an academic semester or at least 6 credit hours during summer sessions, whether or not the student holds a graduate assistantship.