This was once a 10 meter dipole but his life was cut short by the bottom of the sun spot cycle...

 I just took one half and stacked it but cut the bottom section for 15 meters and then adjusted the top section for 20. It is real easy to change.
 Radials are cut for 15 and 20 and this seems to work well.

 I am looking forward to trying it on the Outer Banks of North Carolina in/over/near calm salt water with flat terrain