This research provides experimental data on the effect of radio interference on SBAS characteristics. Radio interference is obtained by retransmission of GPS signals and correction signals from SBAS geostationary satellites. In the navigation receiver configured for SBAS operation mode through microwave power adder receives retransmitted signal and standard signal from two closely located antennas. The messages produced by the receiver are recorded in binary form. In parallel, a second receiver is switched on, which receives SBAS standard signals from a separate antenna. The data are recorded by the receivers and processed by the PEGASUS software system, its own programs and compared. When the receiver was operating in normal mode, navigation characteristics corresponding to an LPV 200 approach were provided. When the receiver was operating in radio interference mode, position deviations and protection levels increased and Stanford plots showed SBAS unavailability at 665 points from 11,000. On separate time intervals, the position deviations are in the horizontal plane 8 m–25 m (95%), in the vertical plane 40 m–25 m (99%).