Flatscreen '75 Excella 500

[obxgal]

Our "new" Excella has the crank-up antenna...and a two-holed plug over on the wall. I'm going to get a new flatscreen and want to use the antennae for non-satellite digital reception...but the two-hole thingee baffles...i found a plug on the internet, but..

-do I need some kind of transformer?? I read that the old plug was for 300 ohm and now it's 75 ohm.....

-do i need to pull thru the old wiring and replace with new coax??

I realize i may need a new motor for the rotator, but I'd like to get to the point where I can plug in a TV and see if the antennae works at all...:=)

Any help clearing the mud??
Susan in VA