At 50 ft, KTAL-DT has a NM of 4.4dB and KTBS is -8.7dB.
Signal strengths below that is almost impossible.
On a 4228 if the signal is oscillating around some of the bow-ties will have signal others will not, but you will never get the full advantage of the signal.
On the other hand, a yagi like the 91-XG will get the full signal at times and will drop off at times.
Do you find your yagi getting pulses of signal where the picture fluctuates a lot? If so you might try the 4228 and see if it overall collects enough signal to lock. On the other hand if it is rather stable, you'll be better off with the 91-XG (which really is no all that small overall with the reflector being 22" high and 20 " wide).
It would be interesting to set up two antenna systems side-by-side in a fringe to deep fringe area, one with the 4228 and one with the 91-XG over open flat territory and see how each performed, then set up both in a hilly situation and see which was best there.
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