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In this paper the method for estimation of 1.1. Reasons for detection DOA signals' direction of arrival (DOA) directly at RF frequency without baseband conversion and without Reasons for DOA detection may be divided as demodulation is described. We will estimate DOA by a follows multiple array of antennas with an array of six-port a Radiation pattern alignment to required direction. reflectometers (SPR). To estimate an angle of arrival we have applied the RF receiver with two and three antenna elements connected to two and three SPRs. To illustrate the * Interference reduction in other directions. performance of the proposed receiver, a physical radio a Transmitter power decreasing, so decreasing channel is modeled without fading, so there exists the lineinterference level in other receivers. of-sight connection between the sources and the receivers.