GS89 Steel Mast Headframe, 4-Sector

APAC's GS89 galvanised steel headframes are designed to slip over the top of any GS89 series mast. The 100x100 socket secures over the 89 x 89 mm mast with the supplied 4x M12 tap bolts. The term spigot, tenon, and single-tube headframe are used interchangeably.

Constructed from a 900 mm (0.9 metre) length of 48.3x2.9 mm Circular Hollow Section welded to a 100x100 SHS socket, three arms protrude 500 mm at each quadrant (0, 90, 180, and 270 degree angles). The central column is capped to prevent water ingress.

Four-Sector headframes earned their name from traditional wireless network deployment which used an ABAB frequency configuration, such that radios using a shared frequency were placed 180° to each other for maximum isolation. These days, this type of headframe is more commonly used to maximise mounting area, aiding projects requiring a mixed collection of wireless radios, cameras, weather monitoring sensors, etc.