Something "CATCHING" Down the Steering Column

Does it catch shortly after you begin turning in either direction? Or does it feel like a singular spot every 360* of the wheel turning
If you can't physically see it hitting something in the engine compartment my first guess would be that one of your lower ball joints in the steering linkage (1 ball joint per wheel and 1 joint at pitman arm and 1 joint at idler arm) is loose and as you turn from side to side it's shifting around in its socket.
I'm just shooting in the dark though without any more information