Numericall assigning cells in VBA

Good afternoon everybody,

Excuse me for my title, but I really don't know what tag I could give my problem.

Here it is:

I'm trying with the help of VBA to find cells on a numericall way.
I'm looking for data in a cell. If this data meets mt requirements, than I will asign a 1 to range("J27"). (pure for testing).
The first data is in cell F11. The one in F12 etcetera. This has to be done for a whole lot of F's. Also, all the data is not +1 from each other, so then I will use i+3 for example. But because of the fact that this data can be extended in the future, (and a lot!), I have to work with an "i".

This is what I have so far:

For i = 11 To 20

If Sheets("Configuration generator").Range("F" & i) = "=No Jib" Then
Range("J27") = 1
ElseIf Sheets("Configuration generator").Range("F" & i) = "=Extended" Then
Range("J27") = 1
ElseIf Sheets("Configuration generator").Range("F" & i) = "=Retracted" Then
Range("J27") = 1
End If

i = i+1

Next i

When I run this, nothing happens.
My suspicion is that I have to Define "i", or that there is more wrong with my code.
I hope that you understand my story and also that you can help me with it!

Thank you in advance!

Kind regards,
Bart