As fate would have it, you have a hill right in front of you in the signal path to Baldy. Since KMVU is very low power (16.2 kW max) with a directional antenna that only sends about 5600 watts in your direction, there isn't much power available to allow the signal to diffract over that hill very effectively.
Several options are possible:
1. Moving antenna as already suggested. Several times, if needed. Be patient and be careful.
2. Adding a low noise, medium gain pre-amp at the antenna. I doubt that the amp that came with the Terk qualifies.
3. Upgrading to a much stronger UHF antenna and keep #1 in mind. These signals do not obey our wishes.