Horn antenna, with an N connector and a waveguide, it's been partially dipped in some kind of conformal coating for weather resistance. I know it's dual frequency. The "N" connector is for 5.7-5.9 GHz. Will cover the 5.65 - 5.925 GHz band.  The waveguide is for 3.7-4.2 GHz. This can probably be retuned by the screws to outside this range. Should be able to cover the 3.3-3.5 GHz ham bans.  The "N" connector is to a waveguide adapter that could be removed for waveguide access. It is linear polarized.  This is good for ham amateur radio microwave experimentation, hilltop DX, that sort of thing.