The calculation of the antenna gain for a path between Trx1 and Trx2 is performed as follows:
Gain in horizontal plane: if a horizontal antenna pattern is defined, then 
(Eq. 162)
Gain in vertical plane: if a vertical antenna pattern is defined, then: 
(Eq. 163)
When the two antenna patterns (horizontal and vertical) are selected, this means that the horizontal and vertical planes are combined and SEAMCAT calculates the resulting antenna gain as a pseudo 3-D antenna gain based on multiplication in linear domain of the horizontal and vertical gains:
(Eq. 164)
(Eq. 165)