I took a bunch of RF / coms classes during my MSEE. Those were some of the hardest for me to learn - and we were few students. Never more than 10, but usually in the 3-5 range depending on how "general" the classes were, with microwave engineering being the biggest class.

Do undergrad EEs get work as RF engineers? Again, when I went to school, so many of the RF classes were mostly grad school classes, or at very minimum last year undergrad classes. I personally did not have any during undergrad. So many prereq courses.