Re: Any way to manually tune to a specific OTA frequency?
Unfortunately, no. Roku TV does not offer any way to manually add an OTA channel, nor to directly tune to an OTA channel. One exception might be using the Roku app on a phone or tablet. It does have a keyboard function, that has numbers as well as letters. What I don't know if it works to select a channel, as I've never used it for that. But that's the only possible exception. Roku doesn't offer a remote with a number pad, nor an onscreen virtual number pad.
Dan Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.