If you're ever interested in some light reading to start to know this stuff more...
The ARRL Antenna Book is a good top level overview on the
basics of antenna design and how RF works the way it does. Lot of cool topics to start diving into in there. I've heard that older editions have been more useful and had better info, but i haven't been able to track any down. Another good ref book is the Art of Electronics. Both are GREAT at really diving into some of the engineering behind our radios, antennas, signal propagation and how to start getting them most out of them.
My professional background is in space stuff, in which we deal with a lot of similar stuff... so most of my test studying consisted of skimming the books, getting a good grasp of the regulations and then just taking the tests. I guess thats why I find some of the lack of encouragement for going for higher license levels odd, as here (both work, and ham clubs here) we're very actively encouraged and pushed to learn and grow our knowledge. Knowing how to USE that is the other half of the battle, but making mistakes is half of that.
My personal backround is that I got into this silliness originally for offroading, then curiosity got the better of me and now I' m an extra, lol.
Then again I'm in the Bay Area, local ham clubs have been pretty entertaining groups, and generally have great talks. But we end up with a TON of super smart people in a small room... sometimes its good, sometimes its weird but generally its interesting. I never really got into it for the whole making contacts and talking to folk the way that some club members have gotten into it, but the hobby as a pure technical interest is what brought me here.