[TowerTalk] F-12 EF- 515

[Wayne Kline]

In preparing for   a redo on my 15 meter antenna system. I began rough setting in place a F-12  EF 5 15 five  element monoband yagi 
 the element positioning are a no brainer but some how some where the tubular hairpin got GONE . I remember when I removed it from the previous owners installation
A 3/8 tube bent in a elongated hoop.   
 
So dose anyone have any info as the  LENGTH  of this match ?   it's a none adjustable !!!    
 
Wayne W3EA