D&D4 Wiki
Attack bonus if proficient +2
Weapon die ([W]) 1d12
Type ranged
Range 25/50
Handedness two-handed
Proficiency category superior
Weapon group
Weapon property load free
Price 30 gp
Weight 5 lb.

A greatbow is a superior two-handed ranged weapon in the bow weapon group.[AV:10]

Loading a greatbow is a free action requiring the use of both hands.

No class has proficiency with the greatbow as a class trait, but any character can become proficient by taking a Weapon Proficiency feat.