I like to repurpose things. The two 6panel pole mounts in the background were made from visiting the local scrap yard. The poles are ~6" ~1/4" thick aluminum from what looked to be some kind of very large dismantled electrical distribution system. The swivel mounts were made from a scrap piece of I-beam.
The main backbone is 3"x4" rectangular tubing ... from the scrapyard, and 2"x2" horizontal stringers. The 3"x4" backbone pivots on a 1" bolt allowing the panels to tilt. The short piece of channel strut allows the tilt to be locked in place. The 1" pivot area of the 3"4" backbone is slightly off center, from long end to long end, to allow for easy tilt adjustment. To change tilt, grab the channel strut with one hand, remove nut, alter tilt, tighten nut, easy peasy. They're two rows of 3/8" bolts down the lower portion of the head. Loosen those bolts, turn, retighten bolts.
This is the new swivel head for next 12panel pole mount. It goes where the bucket now resides. 3/8" flat stock. You'll never guess what the pole is made from ... you know those yellow poles in the parking lot that keep stuff from getting ran over? Yep. Welded two of those together.