Just bought a house. It has a tv tower with a rotor up there. I don't
wanna climb up to it so I wonder if there a way to hook up with out
knowing what I have.

The rotor(brand unknown) has a cable coming down from it which has 4
wires. One wire has NO continuity between the others. The other 3 wires
all have continuity between each other.

My Radio Shack controller has terminals for 3 wires.

I know this probably sounds like a stupid question, but is there a way
to know what wires go to what, and how (or if) they can be hooked up to
my controller.

The only equipment I have for testing is a multimeter.