I use an 80-meter horizontal loop, absolutely my favorite all-around antenna, resonant on every harmonic, and once you get to 20m, the angle of radiation is very low and you even start to get some gain. I've worked Australia, Antarctica, Falklands, and Japan, as well as Europe and the Middle East with 100-150 watts. Of course that was at the top of the last cycle. My problem now is that the 80m bandwidth is centered for CW, once I get up to 3.8 MHz and above the SWR is really an issue. I'm building an NVIS antenna for 40 and 80, but as Jackalope said, once you're out past 300-400 miles it's not effective. It's intended to be car-transportable, I wanted something I can throw in the trunk and use for local/regional comms if the need arose.
Better news is that my work schedule is changing after next week, I'll have Tuesday nights off, for a while anyway. Probable that I'll have EVERY night off soon, whenever work jumps the shark and mandates the clot shot for employees.