They're more easily seen just now too with all the leaves off.
Try whistling for them
A high long, tailing off at the end, "Wheeeeeee", repeated just as you take the time to draw a long breath, and if they're soaring they'll gyre back to come and see what's making the noise
Kind of brilliant when you can call the birds like that
They circle a bit and when they see nothing they just glide off.
cheers,
Toddy