Uh a lot lol but I can rattle off some stuff: gain, db, dbi, dbd, dbc, dbm, dbw, left right circular and slant polarization, antenna shortening effect, antenna patterns, sidelobes, baluns, characteristic impedance, SWR, VSWR, S11, S21, s parameters, antenna coupling, reading s parameters, different types of antennas like dipoles, parabolic reflectors, a lot of radar stuff, modulation types, and some other stuff. I think that's most of the antenna specific topics
@fwtimini As a Hilton diamond member I can say most don't. You can legit walk into almost any normal hotel and get free breakfast. Everyone in the comments is talking about resorts which is different