What Al and Missy said. On an unmodified AS the answer is no. Your cable connection outside runs to the front of the trailer thru the skin and connects to both TVs. The Antenna works off the same set of wires and is activated by tuning the antenna on by the front TV, pushing in a little button. When that button is pushed in the cable part of the system is essentially turned off and you cannot have both on at the same time. Easy to switch back and forth, however.
2020 28' Twin Flying Cloud-(Our 5th Airstream)
USAF Master Training Instructor (TI) - 68-72