But that is almost entirely determined by your distance to the transmitter. I'm 50 miles away from the transmitters, the best I could do with any indoor antennae, even amplified was one of the four major networks consistently, and one other one intermittently. With my outdoor, even non-amplified, I get all four consistently and only have even occasional outages with one.
When I lived 10 miles from the transmitter, it was no issue to get everything.