How to calculate the Antenna gain

sir
i m doing project on microwave link planning. i want to calculate the gain of antennas as wel as the latitude and longitde distance in matlab.
can any body helps me in this regard. ishall be very thank ful to u.

can any body provides me the matlab code or user guide.

best wishes.
Virus king

There are a number of ways to estimate the gain of an antenna.

Here is one: G dbi = 10 log10 ( 4 Π (effective aperture area) / λ2) * efficiency


The distance on the surface of the earth may be calculated using spherical trig. Look up the details is Bowditch ( a bible in the boating world).

Added after 7 minutes:


There are a number of ways to estimate the gain of an antenna.

Here is one: G dbi = 10 log10 ( 4 Π (effective aperture area) / λ2) * efficiency


The distance on the surface of the earth may be calculated using spherical trig. Look up the details is Bowditch ( a bible in the boating world).

It seems as if you are doing a radio link budget. You should use the radar equation