The Flann 12240 is a standard gain microwave horn for C-band, 3.94 - 5.99GHz. The -20 suffix indicates 20dB gain. Paired with the model 12094-NF10W waveguide to N-type coax transition to provide a convenient test antenna solution. The 12240-20 is a large mid frequency variant of the Flann standard gain horns

This item is in good cosmetic condition, with paint chips and wear as can be seen in the photos. It is a large horn, approximately 26x19cm at the open end, and 56cm long.