The old Hand Crank was likely a Winegard Sensar II or III THe latest, which happens to be the greatest is the Sensar IV it comes WITH the Wingman already in the box.. And if you are doing a replacement of an Omni it is what I recommend.
If you already have a Sensar II or III adding the Wingman is your best choice. I don't know how the II and III with wingman compare to the IV but I'm guessing it's fairly close to identical.
IN addition. instead of the standard wall plate with the 12 volt outlet, antenna connection, switch and light I suggest the SENSAR PRO (about a 100 dollar upgrade)
This is what I use and it has outperformed all competition.