Well, there's aviation, mil. air, MURS/FRS, GMRS, amateur radio, fire department/rescue, etc. FWIW I've been monitoring HF aviation as well as broadcast shortwave listening. I am currently in an apartment and my antenna (AOR SA7000) is sitting on a box in the corner of the living room. Yes, scanning has changed and will probably never return to un-encrypted transmissions, but there is still a lot to monitor.
"We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm" George Orwell