For free space path loss, fc=1.5GHz (Carrier frequency)

If we take different antenna gains such as 1.(Gt=1,Gr=1)and 2.(Gt=1,Gr=0.5)and 3.(Gt=0.5,Gr=0.5)

When we reduce the antenna gains (i.e. the transmitting gain or the receiving gain) there is an increase in the path loss of propagation of radio waves in wireless channel. The average signal strength level at the receiver gets decreased, along the distance from the transmitter to the receiver