Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An excellent reference book or self tutorial!

I ordered this book to assist in refreshing my memory about RF Circuit Design and associated equations. I found it to be a great source of advice on the "how to's", as well as a wonderful reference source for the basic equations involved, which I haven't used actively in some time. Since my old reference/school books are in storage, I needed a concise, compact and easy to understand presentation of the application of the math to real world design considerations. I highly recommend it for self-tutoring, for general reference, and especially for those "breaking away from theory and into the real world" of design.