Need help - gate opener programming




I need help with programming my father's E63 to open the gate at his house. I did it with the garage door but don't know how to send the signal back to the car from the gate.
I tried looking on Homelink's website for some signal receiver to mount on the gate. I read that on an UK MB Forum.
Could anyone help me and tell me what kind of receiver I need?
Just as a sidenote I live in Europe (if that changes anything)

TIA




