After much planning and modeling of various different antenna types, I finally settled on a very simple antenna for 160. The reason? This one works just about as well as the larger more complicated antennas, yet it leaves enough room in my yard that I can build better antennas for the other bands, too.
The antenna I chose? The Double-L Antenna by K2KQ, a compact vertical dipole for 160m. I built a monoband version, though others have built this antenna for multiple bands.