Global navigation satellite system usage has led to a significant increase in air traffic. It also led to the emergence of new air traffic participants such as drones and urban air mobility. One of the major weaknesses of the global navigation satellite system is its vulnerability to interference and spoofing. This is particularly dangerous for both manned and unmanned aerial vehicles. One of the methods of mitigating interference is the Advanced Interference Monitoring and Mitigation technology (AIM+). This technology protects against simple narrow-band interference as well as more complex wide-band interference, including jamming and spoofing. This paper presents the results of experimental testing of this technology. We investigated the accuracy and availability of the navigation solution when the navigation receiver is operating under the influence of interference. Three types of navigation antennas were used in this research. The research results are presented in text and graphical form. The conclusions regarding the use of the studied technology were made.