Onside Kick

[Coach Gerry Faust]

I have only worked HL/L in Varsity and Sub-Varsity games.
The games we read on-side kick were also read by the receiving team.(luckily)
For me working this position is my greatest fear during a punt or on-side kick!
I have never used a signal for this obvious play situation.
What type of signal could be used for this play?
Should we signal from the side line or when spotting the ball on the field for the kicker?
God Bless,
Coach Faust