Provided are a bidirectional gap filler apparatus for receiving broadcasting signals and relaying communication signals and a method of transmitting the signals. According to the present invention, the bidirectional gap filler receives broadcasting signals and downlink communication signals, transmits the signals again as wireless signals, and receives wireless signals to transmit uplink communication signals. Here, directional antennas installed to respectively have fixed directivities and repeating units respectively connected to the directional antennas are used. Accordingly, excellent communication and transmission/reception of the broadcasting signals are available even in a RF signal shaded area.