ETS-Lindgren 3109 Biconical Antenna - Manual (Page 18)

18 | Assembly Instructions
To assemble the Model 3109:
1. Slide a belleville washer onto the threaded screw end of one of the
biconical elements.
2. Line up the screw threads with the receptacle hole on the balun and
turn the biconical element until it is firmly secured in the balun.
Do not cross thread this connection or
permanent damage to the joint could occur.
3. Repeat step 1 and step 2 using the remaining washer and biconical
element.