The horizontal members are most likely groundplane and not radiators. I gather the antenna was to be ultimately installed outdoors, so with any significant distance the loss of the coax becomes a consideration. Thankfully, with the advent of WiFi, the demand for cheap low loss coax was created and we got the likes of LDF400 that have significantly better performance than RG213 and also means we don't need to work with Heliax. (if you don't know what heliax is - Google it and compare the loss between RG213/LDF400 and Heliax at 800-900MHz)
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