FRANKLIN COLLINEAR ANTENNA - EXPLAINED BY IT’s INVENTOR
To read the text, click on images to see larger size
(or better right click and then choose “Open Link in New Tab”)
Start reading from “Complete Specifications” at bottom of page 1.
https://c2.staticflickr.com/8/7749/18197545158_3d4969de91_n.jpg . https://c1.staticflickr.com/1/480/18197560618_58c172230d_n.jpg . https://c1.staticflickr.com/9/8805/18381310612_6c7ea0d0c8_n.jpg . https://c1.staticflickr.com/9/8799/17764783483_03099420e2_n.jpg