This is an excellent source of problems if you are an undergraduate electrical engineering student enrolled in a class concerned with electromagnetics, which is probably one of the toughest courses you'll face as an undergraduate. Although the selection of problems is excellent, there is something to be desired with the explanation sections of most chapters. The author makes numerous references in equations to vectors that he fails to identify either verbally, or with a diagram. Also, I thought there were insufficient diagrams to adequately convey the concepts being presented.
I also thought it was odd that the first chapter was dedicated to such an elementary concept as vector analysis when there are much more complex mathematical concepts such as multivariable calculus and partial differential equations being used throughout the book that are not given an explanation. If you are studying electromagnetics, the best textbook out there is "Engineering Electromagnetics" by Nathan Ida. Ida explains absolutely everything about electromagnetics, and the problems in this Schaum's outline complement both the material and the problems in that book very well. The last few chapters in this Schaum's are on antennas and waveguides. It is a nice overview, but it is a somewhat shallow treatment.
A good supplement for that material is a 1968 Schaum's outline that is now out of print - "Schaum's Outline on the Theory and Problems of Transmission Lines" (ISBN 0070107475). It contains complete treatments of impedance and admittance matching topics, Smith chart fundamentals, plus many good worked examples and practice problems. The only drawback of this older outline is that the techniques used don't incorporate more of the modern numerical methods that are now more prevalent.