ETS-Lindgren 3180B Broadband Mini-Bicon Antenna - Manual (Page 15)

Specifications | 15
C AGE E LEMENTS
Model 3180B, Cage Elements
Width (Element, tip-to-tip): 66.3 cm
26.1 in
Length: 72.2 cm
28.4 in
Diameter: 40.0 cm
15.7 in
ETS-Lindgren recommends using a 6 dB pad attached to the end of
the antenna; otherwise, high VSWR may occur.