[ADTech]

If you're not getting anything without a pre-amp, you have something severely wrong with your system or its location. You have signal margins at your location with surplus signal margins of over 35 dB plus an antenna with a presumed UHF gain of ~10 dB.

That suggests that one or more of the following is affecting your reception:

You're in a dense forest.
Your roof contains metal that is blocking the signals from the antenna.
The antenna is assembled incorrectly or has a defective matching transformer.
The antenna is situated either behind or too close to some metallic object that is detuning it or is blocking the signals.
You have a defective coaxial cable or connector somewhere in the signal path.
There is an unidentified component somewhere in the system that's severely attenuating signals. Old satellite multiswitches are the most common if reusing coax from a Dish or Directv install.
Defective tuner.

As NSAA, suggested, move the antenna and see if reception of that Fox station improves. Yours is a very common problem and correcting the antenna location is almost always the solution to the problem.