[rabbit73]

Welcome to the forum.

The amplifier for the Terk HDTVO is in the antenna; the part inside is just the power injector. You haven't added a second amp have you?

The HDTVO is a very directional antenna. Does it pick up FOX if you aim the antenna at about 78 degrees magnetic? If yes, then you will need to rotate the antenna for FOX or use 2 antennas with an A/B switch to select which direction you want. Hopefully your TV has the ability to add another channel after scan so that you don't need to rescan every time you change direction.

Another alternative would be an antenna without a reflector to make it bi-directional so that it will get both directions at once. One example would be a 4-bay UHF antenna with a folded dipole for VHF combined with a UVSJ. That setup would probably need a preamp at the antenna for NBC; try without it first.

If the MS2000 didn't improve your reception, that would seem to indicate that you need a directional antenna aimed at FOX instead of an omni.