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More than one antenna can be mounted on the same mast (pole). It's best to have at least 3' of clearance above and below an antenna. That means that a 5' mast on the roof is going to be less than ideal for mounting two antennas. A 10' mast would provide plenty of separation for two antennas and adequate space for three.
Back to my first post... I'm suggesting you start with a system capable of receiving the available signals from the NNE. With that basic equipment you can test the reception from other directions and decide if there is any reason to invest more money in additional capabilities.
My prediction is that with a single antenna, you will not find a compromise aim point that gives simultaneous reliable reception of the signals from the NNE and SE. The reason; The antennas needed to deal with the rather weak signals are necessarily directional and therefore receive well toward the front and very poorly from the sides. However, if there is no signal of interest from the SE, save your money.
If you opt to add reception of a UHF signal from the south, you'll be facing a bit of a technical challenge when you try to combine it into the main system. The filter device I mentioned would be one way to combine two antenna systems that would otherwise interfere with each other.
Again, start with the basics, then add to the system if indicated.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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