A system configured to transmit a signal back towards a transmitting source, the system comprising: a) at least two antennas (105', 105") being mutually synchronized for enabling to transmit the signal back towards the transmitting source in a substantially precise angular direction; and b) at least two communication units, each of which is connected to its corresponding antenna (105', 105"), said each communication unit comprising: b.1. a receiver for receiving a wideband signal from the transmitting source; b.2. an Analog-to-Digital, A/D, unit for sampling the received wideband signal for a predefined period of time, giving rise to signal samples, each of which has an amplitude and phase; b.3. a digital memory unit for storing the signal samples of said received wideband signal in its memory in a given sampling order, on a time scale; b.4. a processing unit for reconstructing a wideband signal, including: b.4.1. deciding about at least one sub-group of signal samples that are sampled within said predefined period of time; b.4.2 performing spectral decomposition of signal samples, obtaining to a set of frequency components; b.4.3 performing phase conjugation to each of said frequency components of the wideband signal within said at least one sub-group, giving rise to phase conjugated signal samples; and b.4.4. reconstructing said wideband signal by using said phase conjugated signal samples as data carriers, giving rise to a reconstructed digital signal; b.5. a Digital-to-Analog, D/A, unit for converting said reconstructed digital signal to a reconstructed analog signal to be transmitted; and b.6. a transmitter for transmitting said reconstructed analog signal back towards said transmitting source substantially simultaneously from said at least two antennas, each signal sampling of each communication unit being performed substantially synchronously with respect to at least one other communication unit. a) at least two antennas (105', 105") being mutually synchronized for enabling to transmit the signal back towards the transmitting source in a substantially precise angular direction; and b) at least two communication units, each of which is connected to its corresponding antenna (105', 105"), said each communication unit comprising: b.1. a receiver for receiving a wideband signal from the transmitting source; b.2. an Analog-to-Digital, A/D, unit for sampling the received wideband signal for a predefined period of time, giving rise to signal samples, each of which has an amplitude and phase; b.3. a digital memory unit for storing the signal samples of said received wideband signal in its memory in a given sampling order, on a time scale; b.4. a processing unit for reconstructing a wideband signal, including: b.4.1. deciding about at least one sub-group of signal samples that are sampled within said predefined period of time; b.4.2 performing spectral decomposition of signal samples, obtaining to a set of frequency components; b.4.3 performing phase conjugation to each of said frequency components of the wideband signal within said at least one sub-group, giving rise to phase conjugated signal samples; and b.4.4. reconstructing said wideband signal by using said phase conjugated signal samples as data carriers, giving rise to a reconstructed digital signal; b.5. a Digital-to-Analog, D/A, unit for converting said reconstructed digital signal to a reconstructed analog signal to be transmitted; and b.6. a transmitter for transmitting said reconstructed analog signal back towards said transmitting source substantially simultaneously from said at least two antennas, b.1. a receiver for receiving a wideband signal from the transmitting source; b.2. an Analog-to-Digital, A/D, unit for sampling the received wideband signal for a predefined period of time, giving rise to signal samples, each of which has an amplitude and phase; b.3. a digital memory unit for storing the signal samples of said received wideband signal in its memory in a given sampling order, on a time scale; b.4. a processing unit for reconstructing a wideband signal, including: b.4.1. deciding about at least one sub-group of signal samples that are sampled within said predefined period of time; b.4.2 performing spectral decomposition of signal samples, obtaining to a set of frequency components; b.4.3 performing phase conjugation to each of said frequency components of the wideband signal within said at least one sub-group, giving rise to phase conjugated signal samples; and b.4.4. reconstructing said wideband signal by using said phase conjugated signal samples as data carriers, giving rise to a reconstructed digital signal; b.4.1. deciding about at least one sub-group of signal samples that are sampled within said predefined period of time; b.4.2 performing spectral decomposition of signal samples, obtaining to a set of frequency components; b.4.3 performing phase conjugation to each of said frequency components of the wideband signal within said at least one sub-group, giving rise to phase conjugated signal samples; and b.4.4. reconstructing said wideband signal by using said phase conjugated signal samples as data carriers, giving rise to a reconstructed digital signal; b.5. a Digital-to-Analog, D/A, unit for converting said reconstructed digital signal to a reconstructed analog signal to be transmitted; and b.6. a transmitter for transmitting said reconstructed analog signal back towards said transmitting source substantially simultaneously from said at least two antennas,