Instruct: Classify a given Amazon review as either positive or negative.
Query: Only for beginners.

I purchased this book with expectations of seeing some worthwhile equipment to build, perhaps a spectrum analyzer, but found only very simplistic designs that cost as much to make as buying a new piece of commercial equipment. I would direct potential purchasers to The ARRL Handbook for Radio Amateurs instead. There are likely other books also that will fill the void left by this book.