A high-gain antenna will preferentially radiate in a particular direction. So converting between dBi Antenna Gain is a parameter which measures the degree of directivity of the antenna’s radiation pattern. A reference dipole antenna is defined to have 2.15 dBi of gain. This means the signal is less likely to be obstructed by obstacles such as buildings, trees or mountains.dBd refers to the antenna gain with respect to a reference dipole antenna. A medium gain antenna (6.6, 5.1 dBi) has a more rounded, wider pattern than a high gain antenna. Antennas like GME’s AE4706/B or the AE4006 are both high gain 8.1 dBi antennas and are ideal for these uses.
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