External Atsc Tuner I Have A Mag/Phillips 51 MP6100D With Int ATSC Tuner & Dig Cab Tuner. How Do I Attach An External HDTV Antenna

I have a Mag/Phillips 51 MP6100D with int ATSC tuner & Dig cab tuner. How do I attach an external HDTV antenna - external atsc tuner

I did not ask for a plan, but would be if you describe the sequence of the estimated compounds. BTW, I try w/75ohm coaxial antennas, two (Zenith) and cable connections. I do not know exactly what inputs are on the back of the aircraft available and / or if I am the antenna to a registration or go to the cable box. If I'm right on all How can these channels? Someth also 41.6. Needless to say, I am a novice and need all the help it can get. Thank you in advance.