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A simple rotary dipole which covers from 80m to 6m.
I have tested it on 40/30/20/17/15 and 6m and it works well.
There are three important factors for good results with these antennas.
1. Use open wire or ladder line for multiband operation - not coax.
2. Use a remote antenna tuner to tune for each band.
3. Don't use traps, loading coils or capacity hats to keep the directivity intact (strange, but true in my experience).
In two days testing on psk31 and CW, qso's have been made from VK to Germany, France, Spain, Canary Islands, Russia, Ukraine, Italy, Greece, Indonesia, NZ, Finland, Sweden, South Korea, Kazakhstan, Philippines, China, Fiji and Japan with around 50W.
This is a test bed antenna. I will add a tuned wire reflector to form a two element beam in the future.