Dr. Hertling's "RF Engineering" course at Georgia Tech. The course turned out to be more valuable in the general domain of engineering than about any RF-related. He demonstrated why we learn to do things first by hand, and only then with the help of computer-based tools. (I loved the story of his student who proposed a circuit with a 23 foot stub -- cuz *that's* what the computer software said!) He also emphasized how engineers *must* always remember the cost of things -- how the last 10% cost the most, and is usually already within the bounds of acceptability.