Specifically, what about the HDHR4-2US?

Are there any other models that will cause issues with the Roku? I'm looking at eBay see what is available. This is for use at a seasonal pool club, so I don't have the budget for the latest gen.

I'm a long-time HDHomeRun user (and a big fan). I started out with original HDHR-US, added the CableCard unit (since retired, sadly) and now run a Flex 4K at home.

I'm using the HDHR-US at a different location now and I'm trying to connect to it via a Roku Ultra LT. The Roku cannot find the device ...