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These waveguide to coax adapters have a VSWR of 1.25:1 max. The W187 Waveguide to Coax adapters mate with UG1352/U, UG1353/U, and UBR48 flanges. The WR229 waveguide to coax adapters are compatible with UDR40, UG1726/U, and UG/1727/U Flanges. WR284 waveguide to coax adapters mate with UG1724/U, UG1725/U, and UDR32 flanges.