Sorting usedsheet with macro

I am too new to excel vba to understand a lot of the code I see here which makes it very difficult to find what I need. I have a macro that when executed, sorts my sheet by cols a, b and c. I created it by using the recorder to sort those columns. The problem is that it comes bach with

Range("A1:H345").Sort Key1:=Range("F2"), Order1:=xlAscending, Header:= _
        xlGuess, OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
        DataOption1:=xlSortNormal

which works, but only until I add cols or lines. When I add cols, the range of the sort fails to include the new columns because of the hard coding of col/line numbers. I can't figure out the syntax of how to have it dynamically sort the sheet based on its current used area.

Any help would be appreciated.

Thanks.

PS Is there a way to have this forum notify me when this thread is updated? I haven't been able to figure that out either. Until I figure that out, if you would copy [email protected] with your reply, it would be much appreciated.