off the beam
Mistaken, inaccurate, or incorrect; going against or straying away from the correct line of thinking. Hyphenated if used before a noun. I'm saddened that the president would choose to make remarks about our troops that are so off the beam. The CEO's off-the beam plans ended up costing the company nearly half a billion dollars in lost revenue.
off the beam
Off course, on the wrong track, as in He's way off the beam with that argument. This colloquial term and its antonym, on the beam, meaning "on the right track," allude to directing aircraft by means of radio beams. [Colloquial; mid-1900s]
on the beam
On course; on the right track. This colloquialism originated about the mid-twentieth century, when aircraft began to be directed by radio beams. Its converse is off the beam, meaning “wrong” or “incorrect.” Both expressions began to be transferred to other enterprises almost at once.