Instruct: Classify Amazon reviews into positive or negative sentiment
Query: "Must have" for anyone in Satellite Communications.

Bruce Elbert's Introduction to Satellite Communications is the very best starting point for learning the basics of communications by satellite. Its scope goes beyond generalities but deals with specific topics from the world of satellite. Well organized and readable, it is an excellent companion to Mr. Elbert's other book, The Satellite Communication Applications Handbook. Both are "must read" and "must have" references for engineers and non-technical types!