What kind of handheld radio would be best during a zombie invasion?

I am doing a project for school (12th grade sci fi cl) to make a plan in case of a zombie attack. You need to make a emergency kit, and I was wondering what type of radio (handheld) would be best to use in a zombie invasion? One that would contact the widest variety of people (police, government, one that recieves a channel of an emergency, etc etc etc). Thanks for answering!