Gain measures how much of the energy sent from the radio to
the antenna is concentrated in a specific direction, and in which direction
the antenna has the greatest “reach” when receiving a signal.
The gain of the antenna is stated in decibels (dB) and measures
the increase in field strength of the antenna when compared to a reference
can be either an isotropic antenna (dBi) or a dipole
antenna (dBd). Comparisons
can be made between dBd and dBi as follows: dBd=dBi-2.15
use their own “Marine Gain”, stated as plain “dB”,
which is not a true measurement, and simply allows them to put higher gain
figures alongside their antennas. This can mislead customers into thinking
that they are getting more gain for their money.
To allow comparisons of our
antennas with antennas which state performance in “Marine Gain” we
list both true gain in dBi and “Marine
Gain” in dB.