重叠区是射频工程中的词，是在在二个或多个广播站之间的区域，在此区中各广播站以相同的频率发射信号，而且接受到的强度相当。在此区域中会出现同信道干涉的情形。

为了避免此一情形，会使用有指向性天线的接收器，天线方向调整到只接收到一个广播站的信号。或者可以用单边带调制的方式来调制信号。

若是数字广播（包括数字调幅广播及数字声音广播），没有重叠区的干扰问题。

An overlap zone, in radio frequency engineering, is a zone in which the signals from two or more radio stations, transmitting at the same frequency, can be received with comparable intensity. Interference occurs frequently in such a zone.

In order to avoid this, a receiver with directional antenna is used, which can then be aligned in such a way that it will only receive the signal of one transmitter. Alternatively, the signals could be separated using a demodulator in single sideband mode.