Okay, scratch that, I'm still making some mistake. Here's the code I've got:

MsgBox ActiveCell.Address
Dim ActiveLoc As Range
ActiveLoc = ActiveCell.Address
[ActiveRange:N3].Select
ActiveRange.Activate
ActiveWorkbook.Worksheets("D-11 O.F.").Sort.SortFields.Clear
ActiveWorkbook.Worksheets("D-11 O.F.").Sort.SortFields.Add
Key:=Range("ActiveRange"), _
SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:=xlSortNormal
With ActiveWorkbook.Worksheets("D-11 O.F.").Sort
.SetRange Selection.Range
.Header = xlNo
.MatchCase = False
.Orientation = xlTopToBottom
.SortMethod = xlPinYin
.Apply
End With

The MsgBox line returns $A$6, so I know .Address is the right syntax, but
after the message box I get an error message: "Run-time error '91': Object
variable or With block variable not set" and the third line is highlighted in
the debugger. Hovering over it, I get the bubbles "ActiveLoc = Nothing" and
"ActiveCell.Address = $A$6". So something's going wrong with the assignment
of the range value to the variable, but I don't know why. Help?