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These textbooks tend to be aimed at graduate students that have had the following classes:

- calculus 1-4

- diff equations

- linear algebra

- electrostatics/magnetism

- electronics (analog, digital, microwave)

- signal processing

When you see Maxwell's Equations as the first chapter, that indicates prerequisite knowledge in just that. The first chapter in this book is just a summary of the whole electromagnetism class, which is traditionally a pretty rigorous and difficult class.

At least that was the case when I took similar classes during grad school.

Either way, any class on antennas, radars, communication systems, etc. will be a pretty applied type of class, that is the sum of all the pre-req classes.