| http://www.w3.org/ns/prov#value | - To facilitate mounting of the waveguide-type antenna elements of the present embodiment, the header 20 is preferably provided with a threaded shank portion 26, shown in FIG. 13, which permits the header to be readily secured to a transmission line/mounting structure, e.g. a conductive plate having transmission link slots or runways (channels) therethrough, such as a `channeline` plate structure, d
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