Overview Description The Narda (PMM) 639 is a Standard Gain Horn covering 12.4 to 18 GHz. Videos Custom Field Reviews Write a Review Write a Review × Narda Narda (PMM) 639 12.4 to 18 GHz Standard Gain Horn Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *