Hi, I'm newbie in Xbee. i want to know what is the value of antenna gain transmitter of xbee pro s2b?

What is the exact part number of the XBee module you are using?

is this the part number XBP24BZ7WIT-004-revF?
i’m sorry if i wrong
i want to know the gain, because i want to calculate the rssi using friis equation and compare the result with real rssi measurment
do you have any idea?