ronking

I own a Ramsey FM 30 Stereo FM transmitter. I want to be able to take it out to a local football field and “broadcast” the football games of our local Christian high school to the folks in the football field area. Since there is no AC power available at this location, I need to know a simple way to hook up a battery or battery pack to the transmitter and a small mixer. Also, I may need a way to recharge the battery at home after the game. If anybody could offer any help with this problem and let me know where I might purchase what I need, I truly would appreciate it! Thanks! Ron King, Pres. First Love Christian Academy .