Abstract: A base for supporting a removable sign post on a surface utilizes a clamp, housed within a tubular housing, to grip and engage the post in a gripping position. The clamp has a clamp element that is flexibly displaceable to grip the post or alternatively has more than one discrete clamp element, each of which is actuable relative to the housing. Actuators, such as setscrews or bolts, are advanced through the housing into engagement with a corresponding clamp element to cause the clamp to grip the post. The actuators are retractable from the housing to cause the clamp to release from the post in a released position to enable removal of the post or insertion of the post into the base.