A tire air pressure monitoring system is provided with at least one trailer-use receiving unit, which is mounted at a rear end of a tractor head to receive radio wave sent by multiple tire air pressure sending units. The tire air pressure sending units are respectively attached to wheels of a trailer. The trailer-use receiving unit, having a directional antenna, is oriented to have a stronger receiving sensitivity with respect to a direction of the trailer than other directions.

 
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> Radio receiver and method for detecting carrier waves

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