An antenna apparatus is provided for use as a base station in a wireless network, and additionally a method is provided for performing spatial nulling within such an antenna apparatus. The antenna apparatus has an antenna assembly that employs a reception beam pattern selected from a plurality of reception beam patterns. During a nulling test operation, a reception beam pattern controller is arranged to cause the antenna assembly to employ each of the plurality of reception beam patterns. Quality metric determination circuitry then determines, for each reception beam pattern employed during the nulling test operation, a link quality metric for each of a plurality of wireless terminals, based on communication between those wireless terminals and the base station whilst the antenna assemblyis employing that reception beam pattern. Reception beam determination circuitry is then arranged to determine, from the various link quality metrics, a reception beam pattern from amongst the plurality of reception beam patterns that is to be used for a subsequent communication with the plurality of wireless terminals. By such an approach, it is possible to alter a reception beam pattern so as toseek to reduce the effects of an interference source whilst also seeking to maintain an appropriate level of link quality in respect of each of the various wireless terminals that are communicating with the base station.