This is an excellent antenna text. I would say in general the heuristic explanations are very clear and a wide range of antennas are covered.

Perhaps at some points the math is glossed over just a tiny bit, and so if you're really trying to derive things along with the text, it can be a challenge to reproduce some of the results.

The introductory treatment of computational EM methods in the last few chapters is truly outstanding! I have particularly enjoyed the chapter on the method of moments -- the formulation is simplified enough so that you can code up your own toy programs. Advanced topics are mentioned as well. Very nice!

The book can be considered an extended foray into the use of Maxwell's Equations. The authors show, essentially ab initio, how you can start from those equations and understand how an antenna works. And how different antennas are optimised for different purposes.

Antennas are described for both transmitting and receiving. There is also a chapter on the advanced idea of antenna synthesis. Here, one starts with a given radiation pattern, and derives a combination of antennas suitable to produce [transmit] or detect it.

The maths treatment involves extensive use of three dimensional vector analysis and surface and volume integrals. Elegant treatments. But the student had better be well prepared.