I got from central Switzerland to Japan on about 10W on 20m once using JT65 or JT9 (I can't remember which). The antenna was a random length of wire tied a rock and tossed out of my fourth-story apartment window into a field below.
I've done US east coast to Australia and New Zealand on 160m, with 5 watts and a vertical. Well, the vertical was 90' of tower and had 40,000 feet of wire underneath it and was feed with 1 5/8" hardline, but still.
