Radio-Frequency Interference is a growing problem in many fields such as satellite communications and remote sensing. One way to help to solve this problem is to develop systems capable to detect and localize the interference source. The instruments PAU-SA and MERITXELL are microwave radiometers mounted in a mobile unit capable of performing interference localization by determination of the angle of arrival. The PAU-SA is a synthetic aperture radiometer working at L1 band. The MERITXELL is a multi-frequency total power radiometer that can be tuned at L, S, C, X, K, Ka, and W bands.