ETS-Lindgren 3142E BiConiLog Antenna - Manual (Page 27)

Mounting Instructions | 27
Mast refers to 2070 Series, 2075, and 2175 Antenna Towers.
7-TR refers to 109042, 108983, and 108197 booms:
 109042 boom—Straight boom; for general antenna mounting on a
7-TR
 108983 boom—Offset boom; for general antenna mounting on a
7-TR with pneumatic or manual polarization; can also be used to
mount stinger-type antennas
 108197 boom—Center rotate boom; for stinger-type antennas
only