According to Greg :

you sure he is pecking at dish, check the surrounding wood, he is
probably attacking wood and dish is noisey because of vibration.

One year we had a red-headed woodpecker land on the roof edge and
peck at the side of the aluminum eavestroughing. Early in the morning
for several days.

Man was that loud, even though it was on the other side of the house.
Would wake the dead. In fact it did ;-)

Some of the time the bird is simply trying to make a loud noise
to attract a mate, rather than actively looking for food. Like
grouse "drumming" in the spring.

[Or the brain-damaged grouse that kept trying to attack us one
spring.]

We eventually managed to scare the woodpecker off. Or, maybe it
found a mate.

I hate to think of what a pileated woodpecker would sound like doing
that. More like an axe taken to a steel barrel.

Mind you, he'd destroy the eavestroughing pretty quick.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.