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... However, would it be possible to use two directional antennas, one pointing to each quadrant and combine them via some combiner? ...
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The UVSJ mentioned earlier is a set of tuned filters. One port passes UHF frequencies, the other passes VHF frequencies. The difference in frequencies between the UHF and VHF bands is substantial so the filters do not need to be especially sharp or of unusually high quality to keep the signals from each antenna separate.
If you attempt to combine signals from two antennas in the same band, there is far less difference between frequencies. To keep one antenna from interfering with the other, you would need higher quality filters which will cost more due to the materials and specialized equipment and skill required to adjust them during final assembly.
www.tinlee.com is one of the few remaining sources of tuned channel insertion filters. My understanding is that they are willing to work with you to determine your specific requirements... this is a custom build solution so expect the cost to be higher than over the counter consumer grade equipment.
I would have a difficult time justifying the expense of combing two UHF antennas. There are many less expensive options to consider. The two suggestions provided thus far are very similar, and both give you a less expensive, and likely, higher performing system than one with tuned combiners.