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This article has a good explanation of TCAS limits. https://www.twz.com/news-features/heres-what-air-traffic-collision-avoidance-systems-can-and-cant-do https:

• giantg2 2y ago
  Yeah, so similar to what I said, the transponder didn't work with that system as that article speculates the UH-60 didn't have it. My suggestion was that you could display what ATC has, hence the data distribution part of my comment. But I guess we could just accept what the article tells us that it would be too dangerous to display that info at lower altitudes and allow pilots to make the call and that we just have to live with these incidents then...