An antenna apparatus comprising: a uniform circular array comprising a plurality of omnidirectional antenna elements; a directional antenna; a rotational mechanism which can cause a rotatable part of the antenna apparatus to be rotatably positioned with respect to a fixed non-rotatable part of the antenna apparatus, wherein the directional antenna is comprised in the rotatable part; a plurality of RF chains, wherein a number of the plurality of RF chains is less than a number of the plurality of omnidirectional antenna elements; selective connection circuitry to couple a subset of the plurality of omnidirectional antenna elements to the plurality of RF chains; sampling circuitry coupled to the plurality of RF chains to sample signals received by the subset of the plurality of omnidirectional antenna elements; and signal detection circuitry to control a signal detection process comprising the selective connection circuitry iteratively coupling subsets of the plurality of omnidirectional antenna elements to the plurality of RF chains and the signal detection circuitry constructing a signal sample spatial covariance matrix for the plurality of omnidirectional antenna elements from the signals sampled by the sampling circuitry at each iteration, and the signal detection circuitry is configured to apply a beamforming algorithm to the signal sample spatial covariance matrix to parameterise the signals received by the plurality of omnidirectional antenna elements, wherein the antenna apparatus further comprises control circuitry to configure a beam pattern of the directional antenna and the rotational mechanism is configured to set a rotational position for the directional antenna with respect to the fixed non-rotatable part, wherein the beam pattern and the rotational position mitigate interference caused by the signals. a uniform circular array comprising a plurality of omnidirectional antenna elements; a directional antenna; a rotational mechanism which can cause a rotatable part of the antenna apparatus to be rotatably positioned with respect to a fixed non-rotatable part of the antenna apparatus, wherein the directional antenna is comprised in the rotatable part; a plurality of RF chains, wherein a number of the plurality of RF chains is less than a number of the plurality of omnidirectional antenna elements; selective connection circuitry to couple a subset of the plurality of omnidirectional antenna elements to the plurality of RF chains; sampling circuitry coupled to the plurality of RF chains to sample signals received by the subset of the plurality of omnidirectional antenna elements; and signal detection circuitry to control a signal detection process comprising the selective connection circuitry iteratively coupling subsets of the plurality of omnidirectional antenna elements to the plurality of RF chains and the signal detection circuitry constructing a signal sample spatial covariance matrix for the plurality of omnidirectional antenna elements from the signals sampled by the sampling circuitry at each iteration, and the signal detection circuitry is configured to apply a beamforming algorithm to the signal sample spatial covariance matrix to parameterise the signals received by the plurality of omnidirectional antenna elements, wherein the antenna apparatus further comprises control circuitry to configure a beam pattern of the directional antenna and the rotational mechanism is configured to set a rotational position for the directional antenna with respect to the fixed non-rotatable part, wherein the beam pattern and the rotational position mitigate interference caused by the signals.