Currently, the bands adjacent to GNSS frequencies are not used by high-power signals, and there is no legislation on receiver performance. Therefore, many not only low-cost GNSS receivers are highly susceptible to interference. This prevents regulatory authorities from assigning these bands to new services, such as mobile broadband services, which contradicts the goal of efficient spectrum usage. To achieve the goal of increased spectral efficiency, the European Commission agreed on a directive (RED 2014/53/EU Article 3.2.) that requires all GNSS receivers to ensure a certain resilience against (legal) interference from neighbor bands.