A multi-carrier receiver selects antennas (A31, A32), i.e. carriers
whereto a small amount of power and data is allocated, for estimation of characteristics
of a narrowband disturber (RFI-Signal-3) in the Radio Frequency Interference
band (RFI-Band), a predetermined band for e.g. radio amateur transmission. These
antennas (A31, A32) can be selected amongst all carriers located
inside the Radio Frequency Interference band (RFI-Band) and at least two carriers
(C1, C2) located outside the Radio Frequency Interference band (RFI-Band).