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Any objects that can reflect signals (including your neighbor's house) can potentially add multipath to your signal, and this can make it more difficult for your receiver to lock on to a channel.
However, if you go with a directional antenna like the MXU47, the chances of severe multipath are greatly reduced. There's no way to know for certain how much of a problem you have until you try it, but my initial feeling is that you should be fine.
You can also use your analog channels as a guide for seeing how much multipath you might be dealing with. If you see "ghosts" or "double-images" on your analog stations, then it's a clear sign that multipath is affecting those channels. If the ghosts are very strong and clearly visible, then it means the multipath echoes are pretty strong.
Sometimes it's possible to re-point the antenna or move it to a different part of the roof to a spot that has less multipath. In any case, a directional antenna is a nice step in the right direction. I'd start with that, and consider additional steps if you find out there are problems.
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