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On the UHF side, using an antenna that has a reflector usually helps by making the antenna more directional while reducing some of the reflections.
For VHF, since an equivalent performance antenna would be about 4 times larger than its UHF counterpart, it usually isn't practical to use anything other than a dipole or an adaptation of one.
You're probably going to need to look out your windows that face the direction of the signals and see what might be blocking the signal path - trees, buildings, a hill, etc...
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