I read a book when I was younger that I can't remember the title or the name of the author. The book was a part of a collection for kids and young teenagers. The book must have between 60 and 100 pages. There was a couple of pages with illustrations.
The book tells a story of a geek boy that ends up in an observatory where a group of scientists is searching for aliens using a very large antenna. I don't know how the kid gets there, if he won a competition or something.
So, the scientists show him around. The big antenna, the control room, the accommodations, etc.
They eventually capture a signal that displays a pattern. But spoiler alert,
it turns out there was a nest of woodpeckers inside the antenna.
EDIT: If I remember correctly the book ends without saying explicitly that the signal patterns were being produced by the woodpeckers. The final scene happens when everyone is at the control room, waiting for the signals. They wait for a long time until one of the scientists walks in the room with a folded rag. She unfolds it in front of the main researcher revealing a dead woodpecker. The end!
Does anyone have any idea which book I'm talking about? name? author?