Can I convert a auto searching tv dome type set up

Anything's possible given enough skill and money, but there's no easy way.

Cell phones and satellite TV have almost nothing in common in terms of how the radio works. You can't even re-use the cabling easily.

If you want a stronger cellular signal, get a WeMo or whatever the Wilsom Sleek is called now. Little magnet antenna to stick on your roof, pass the cable through a slide or down the gray tank vent and the phone goes in a little cradle. Easy peasy.