How do I open up case to put antenna cover back on?
Open the battery cover by pulling down. Undo 2 T8 screws holding the top cover on. if you are using the belt clip it's a bit of a pain to remove - a screwdriver in the top pulling up may work - I ended up getting it half way out, then hacksawing off the rest. Then the back cover should unclip. Good luck, inside it's a pretty nice well built radio, except the antenna plastic is a bit weak, and it uses batteries a bit fast.