Hello Bob1103
As more folk standardise on 1080p60/50/24 its gets more critical to ensure your category cables are up to the job.
We have plenty folk running CAT5e at 25m and longer without problems.
Of course 'up conversion' to Deep Color etc is sitting in the wings looking to push even higher bandwidth signals over your cables plus field/lab tests have shown that CAT6 is the absolute best way forward.
No matter if you use CAT5e or CAT6 you need to ensure you 'pull' the cable appropriately and do a good termination job - our install guys are constantly having to re-terminate poorly terminated CAT5/CAT5e cables in new builds.
3 Tips for Installing Cat 5/6 HDMI Systems - CE Pro Magazine Article from CE Pro
Joe