Where in Ohio are you located? I live 30 miles east of Cleveland, and get all local TV channels on the Roku TV app. I've never had any issues with the app failing to receive my area's locals. It is probably as tech support told you--that there is an issue with the app in certain areas.
Fairport Harbor, Ohio
Anyone else? Ohio here. Spoke to tech support. Said there was an issue. Just checking how widespread it is?