ETS-Lindgren 3143B BiConiLog Antenna - Manual (Page 20)

20 | Mounting Instructions
Using Included Mounting Adapters
In addition to the attached mounting bracket and mounting knobs, the
Model 3143B ships with these mounting adapters:
 100989 Polarizing Mounting
Adapter with 7/8 –14 thread
receptacle
If you need to convert the polarizing
adapter to a 1/4 –20 receptacle,
insert the 1/4 –20 thread insert into
the polarizing adapter
 105861 1/4 –20 Thread Insert