Step 1: Some trig
I laid them out 8 8 8 and then backed them with 4 8 8 4 as you can see in the drawing. Initially I put them back to back, but they were too wobbly, so i put them together in a "T".
I added two 1x4 sections with a "U" cut out in the top to lay the lights in. See photo. This created two "valleys" for the light strings to go through.
When I had the 24 foot pole put together, i dug about a 3 foot hole, and put the pole in it.
Step 2: Base
That being said, I need 12 four foot pieces of 2x4. Each one was cut 15 degrees on each end (photo).