Chimney Antenna Farm

Living in a rental property as I do, and residing in a neighborhood with antenna restrictions, my ham radio antennas must be low profile and leave no holes.
I've always been a minimalist when it comes to my antennas. What ever works and doesn't fry my radio I'm good with. 20 years ago, when I lived in a small apartment, I had a ten meter whip on a mag mount on top of my refrigerator. I worked 10 meters around the world with 25 watts and my fridge antenna.
I carry on that tradition with a 900 Mhz Larsen  strapped on to my chimney's spark arrester and a CB mag mount cut for 10 meters stuck on the other side.