Blaw-Knox tower

The term Blaw-Knox tower (or radiator) usually refers to radio towers of a distinctive "diamond cantilever" design, stabilized by guy wires attached only at the vertical center of the mast where its cross-section is widest. The Blaw-Knox company was an American manufacturer of steel structures and construction equipment based in Pittsburgh, Pennsylvania. During the 1930s AM radio broadcasting stations adopted single mast radiator antennas, and this Blaw-Knox design was the first type used. A 1942 advertisement claims that 70% of all radio towers in the United States at the time were built by Blaw-Knox.

The diamond-shaped towers became icons of early radio broadcasting in the US. Several are listed on the United States National Register of Historic Places, the distinctive diamond antenna design has been incorporated into logos of various organizations related to radio and a very large (scale) replica of the WSM (AM) Blaw-Knox tower has been built into the Country Music Hall of Fame and Museum.

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