"Take header" is an informal phrase used as a substitute for the verb "to fall." Antonyms for this phrase would include "rise," "ascend," and "climb." These words describe movement in the opposite direction and imply a sense of progress, rather than a setback or failure. Other antonyms for "take header" could include "stand," "hold steady," and "remain upright," which further emphasize the stability and control of the object or person in question. Using these antonyms can help to shift the tone of a conversation from negative to positive, and provide a more optimistic outlook for the future.