This thing is advertised as a book even novices can use for fast and easy cb repairs-I got it and it certainly is not for novices!Sure,it has some valuable information-if you're a tech and can understand all the gobbledegook!No diagrams-just a lot of text and some schematics I could have gotten for free!I would have been better off spending $19.95 on a case of good beer!It's an ebook so I can't even use it to wipe my butt!It does show the latest mods for some radios so maybe will be useful to share with others.