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This set up has worked great for five years and now channel 33 is gone in the last month. Just curious why it quite working now. There are trees but they haven't affected it before and right now there are no leaves so it seems strange that would be a factor this time of year.
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Trees are growing continuously, even in the winter when the growth is imperceptible.
Reception problems caused by trees is usually seasonal with reception improving when the leaves drop in the fall and then degrading again when the leaves return again in the spring. However (and this is important in YOUR case), reception problems can return as early as January or whenever the sap starts running back to the trees' extremities in mid to late winter. It is the water content in the trunks, branches, limbs, and twigs that shred the incoming signals, the trees are simply the conduit for the water.
Due to the cliff effect that is characteristic of digital reception, a signal that just happens to be near the edge of the cliff but is received "perfectly" doesn't require much more degradation for it to get pushed off the cliff.
Fixing your particular problem is usually pretty straight forward - either move the antenna or move the trees. The second is often not feasible and, for the first, you usually will find that fixing one station's reception sometimes damages another so patience is required.
Adding an amp is usually a Band Aid that sometimes works if the underlying cause is simple signal attenuation caused by trees. But, reception behind trees is rarely that simple. Sometimes, swapping to a different antenna that has a different reception aperture can provide relief. In either case, the improvement is often of a temporary nature since, as I already mentioned, trees are ALWAYS growing.
Understanding the underlying issue is usually important in resolving the problem.
Best of luck!