Antennas Take off angle

I need help to measure the take off angle of a loop antenna as well as how to modify take off angle of an antenna(parameter that affect take off angle).

Also let me know the measurement set up of take off angle of an antenna. That would be of great help to me.

Thanking you,

can u plz explain wat is take off angle ?

The antenna?s take-off angle is the angle above the horizon that an antenna radiates the largest amount of energy.

It is also called as angle of radiation.