The phrase "more offbase" can be seen as an expression of being wrong or incorrect. Antonyms for this phrase would include words such as accurate, correct, truthful, precise, exact, valid, and sound. These antonyms imply a sense of being right or accurate, and can be used to counter or contrast the negative connotation of "more offbase." By using these antonyms in speech or writing, one can express a sense of confidence in their knowledge or beliefs, and convey a sense of authority or expertise on a given subject.