Okay great, is the game complete now? I can't open the door and I can't open the radio antenna box.
The game is not complete. The door on the shed is locked. The key to the shed is located in the watchtower on the table. To unlock the shed, pick up the key and click using LMB on the lock on the handle. Then you can open the door. The radio antenna box is not meant to open, it is an unfinished part of the game right now.