
NGC 3556 is frequently observed by amateur astronomers and shows up as a faint patch of light. It is quite faint.
Right now it is at about 33° altitude and reaches 34° around 10:48 PM.
It stays above 30° for roughly 4 hours.
Galaxies are sensitive to light pollution, fine detail requires darker skies.
This object is better suited for experienced observers.
In small telescopes it remains mostly unresolved.