Range of my handheld cb radio?

i have a 5 watt-6 channel realistic trc-208 (i know its old), its in pretty good condition and can receive and intercept cb radio frequencies (obviously).....so i want to know how much range i can get out of it.......i use the best energizer aa batteries, I use the stock antenna (telescoping top loading antenna....about 2 feet long) and i live in a heavily wooded area......i plan on mostly using this outside....and want at least to have one mile of range when i am communicating to another handheld radio......any ideas on how far my mileage can be?