Thanks for posting, Matt!
Ultimately I did not relocate the bird after only getting two brief but diagnostic views. Both times it was across the dry streambed at bluebird box #9. The birds were moving in and out in waves. Most of them were silent, and it was breezy, which made it hard to detect movement in the upper levels of the trees.
Oh well. I hope someone relocates it and gets photos!
Tim Carney
Parkville/Towson, MD