It measures 3 ½" x 3 ½" x 7". Use with the MFJ-926B / MFJ-927 / MFJ-993BRT automatic antenna tuners or other automatic / manual tuners.ReviewsRecommended for the MFJ-2902,43VERT 160M RANGE EXTENDER, AUTO/MAN TUNER,300WMFJ Enterprises Inc Our Brands:...