Wooden plate / plank put up at 4-5 m above ground

Our company plate (a 1. 5 m plank with logo and text) is to be put on place at 4-5 m up on front of the house. Brackets are already there. Need help because it is quite high up on the facade in front of a large window. Scaffolding? Ladders? Use your imagination and let me know if you can do the job and to what costs.