Doing some further research and modeling, they're looking less and less impressive.
My goal is to put something up for fall/winter for the 48 meter band for Europirates. The big sky loop works well, but I'd like something with some gain toward Europe. I'm also looking at just putting a dipole (folded, for lower noise) up as high as I can, or possibly a smaller T2FD. From models, it really seems like you need to get up to about 80 ft to get good low angle radiation on 48 meters, and I don't know that I have any trees that tall.