There's really no need for a Roku player to have an OTA tuner. Virtually everyone hooks their Roku up to a TV, which has an OTA tuner within it already. Since you can't record with a Roku, there's zero benefit for having two tuners.
For the very, very few people that might connect a Roku to a monitor, which has no OTA tuner, the the HDHomeRun or Tablo are the best solutions, especially since they can feed more than one Roku at a time over the network.
Dan
Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), 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.