ETS-Lindgren 3121D Dipole - Manual (Page 23)

Mounting Instructions | 23
Using the Stinger Mount
The stinger on the Model 3121D enables you to mount to antenna directly to an
ETS-Lindgren 7-TR Tripod Positioner.
Additional hardware is required to use the stinger to mount the
Model 3121D to a mast. For information on ordering optional mounting
hardware, contact the ETS-Lindgren Sales Department.
Shown stinger-mounted onto a 7-TR
Do not use the stinger to mount the Model 3121D onto a 4-TR tripod.