Deja, doves will nest in hanging flower baskets that have mossy
Mediums instead of dirt. I've seen photos of them.
Next season you might try providing one on your deck!

Might be fun for you. Doves are simple birds and don't
make complicated nests. I'll search Google for you later
today to illustrate them. We had huge numbers of
doves this winter on the feeding bench we fed on. They had
quite a pecking order similar to chickens. The really like cracked
corn and millet.