[Problem] To provide an antenna angle adjustment device, an antenna angle adjustment system, an antenna angle adjustment method, and a communications device, whereby the angle of an antenna can be adjusted to a direction in which direct waves can be more reliably received. [Solution] An angle information generation unit 25 that generates angle information indicating the direction in which one antenna is oriented. A reception unit 23 that receives direction adjustment information indicating the direction in which another antenna is oriented. A comparison unit 24 that compares the angle information generated by the angle information generation unit 25 and the direction adjustment information.
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