Formula
Path Loss = 10 Log (4 πd / λ)² - G_T(dBi) - G_R(dBi)

Where,
G_T = Gain of Transmitting Antenna
G_R = Gain of Receiving Antenna
d = Path Length of Two antennas
λ = Wave Length
This tool will help you dynamically to calculate the path loss between two antennas.

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