We consider the scattering of multimodal quantum light by the perfectly conducting cylinder and its emission by quantum two-element phased array antenna. For the scattering description, we use the well-known classical numerical technique based on the characteristic modes adapted to the quantum light. The method is applicable to cylinders of arbitrary cross-section and size relative to the wavelength. It is shown that the antenna emission and scattering are accompanied by the transformation of the quantum-statistical properties of light the second-order far field correlation function becomes directional and the multimodal entanglement is created. The obtained results are promising for applications in various branches of quantum technologies.