getting a script to run from a VBA Call Shell correctly

The following script runs in PS IDE correctly (identifying info has been changed to generics):

 C:\Lena\WinSCP\ /command 'open' 'put ""W:\Master_Library\BUILDERS\WOODSIDE HOMES\THE OVERLOOK\28855.348\28855.348_Rough.PDF"" /' 'exit' 

The issue becomes just how many quotes do I need to get this same script to run in a VBA Shell call.

Call Shell( _
    "C:\Lena\WinSCP\ /command " & _
    """open"" " & _
    """put """" & RootTarget & """" /"" " & _

You can see I currently have “”"" on each side of the variable holding that path - I have tried a couple of different things including single quotes but nothing seems to be working.