The signals from WCAX and WPTZ have to filter through trees on their way to your antenna which is aimed in the opposite (wrong) direction.
This will create overlapping fields that are different for different channels (on different frequencies):
which will create a non-uniform field with hot and cold signal spots:
Each channel will take multiple paths through the trees, creating multipath. As the trees sway in the wind, the paths will change, creating dynamic multipath.
The TiVo is known to be less able to handle multipath.
If you want to be able to use your TiVo, you will have to give it a better signal.
First, connect the TiVo to a UHF antenna aimed at WCAX. If that works, then combine the UHF antenna with your VHF antenna using a UVSJ.
If that doesn't work, you will have to get the UHF antenna above the trees, or forget about using the TiVo.