ETS-Lindgren 3143B BiConiLog Antenna - Manual (Page 29)

Typical Data | 29
6.0 Typical Data
Typical Antenna Factor and Gain
Distance for the ANSI 3-meter and 10-meter calibrations is measured from the
antenna midpoint, and for SAE 1-meter calibrations the distance is measured
from the antenna tip. Midpoint is defined as half the distance between the small
elements and the bowties, which is about 45 cm from the small end tip.