For reference, we have a TCL 55" Series 5 Roku TV. The OEM remote was good for maybe 7 or 8 feet. I bought a "One For All" universal Roku streaming remote Model #URC 11-7935 R06 (Link below) They are $24 at WallyMart. It uses 4 aaa batteries instead of the OEM's 2 batteries, which gives more power and longer battery life. The range is at least 50% better. Our kitchen bar is a good 15+ feet from the TV in the living room and it works. Just know the preset hot keys are different (no Sling) and the remote manual claims the existing presets can be re-programmed. I tried this (to add a Sling hot key) and it was really wonky and doesn't seem to stay programmed. But my main problem was lack of range and this remote does the job, although it's a bit spendy.
https://www.oneforall.com/en-us/universal-remotes/urc-7935-streamer-remote
