  Hidden photon and axion-like dark matter may be detected using spherical
reflective surfaces such as dish antenna setups converting some of the dark
matter particles into photons and concentrating them on a detector. These
setups may be used to perform directional searches measuring the dark matter
momentum distribution. We briefly review the photon distribution one expects to
detect with such an antenna and directional resolution in ray approximation.
Furthermore we consider the regime $m_{DM} \lesssim (R_{sp}\,v_{DM})^{-1}$
where this approximation does not hold anymore due to the photon wavelength
exceeding the expected distribution widths. We discuss how this affects the
expected distributions and experimental implications.
